1977 Porsche 911 Rear Bumper Parts: A Complete Guide to Replacement and Restoration

Restoring a classic 1977 Porsche 911 often means dealing with the rear bumper. Over the years, these parts can rust, crack, or simply lose their fit. Whether you need to replace a damaged bumper cover, upgrade to a lightweight option, or source the correct hardware, understanding the available parts and their differences helps you make a smart choice.

Understanding the 1977 911 Rear Bumper System

The 1977 Porsche 911 (G-Series, model year 1977) came with a distinctive rear bumper design that integrated impact-absorbing components. The main parts include:

• Bumper cover – the outer plastic or fiberglass shell.
• Impact absorbers – foam or hydraulic units behind the cover.
• Reinforcement bar – a steel or aluminum beam mounted to the chassis.
• Mounting brackets – attach the bumper to the body.
• Trim and moldings – chrome or rubber strips along the bumper.

When shopping, you'll encounter terms like "rear bumper assembly," "bumper skin," and "bumper bracket." Knowing exactly what you need prevents returns and wasted time.

Types of 1977 Porsche 911 Rear Bumper Parts

Bumper Covers

Factory original bumper covers for the 1977 911 are made of a flexible plastic called TPO (thermoplastic olefin). They are painted to match the car's color and have a specific shape that accommodates the license plate recess and exhaust cutouts. Aftermarket covers are often made from fiberglass or polyurethane. Fiberglass is stiffer, lighter, and less expensive, but it can crack more easily. Polyurethane covers are flexible and more durable, but they may not replicate the exact factory shape.

Impact Absorbers

The 1977 models used two styles: early foam blocks or later hydraulic absorbers. Foam absorbers are simple, cheap, and lightweight but deteriorate over time. Hydraulic units provide better crash protection but are heavier and more complex. Many restorers prefer to replace foam with new foam or convert to hydraulic if upgrading to later-model safety standards.

Reinforcement Bars

These steel or aluminum beams sit behind the cover and attach to the frame. Original bars are steel and prone to rust. Aftermarket options include lightweight aluminum bars that save weight and resist corrosion. If you're building a track car, aluminum is a popular upgrade. For a street restoration, a rust-free OEM steel bar or a quality reproduction works well.

Brackets and Hardware

Mounting brackets secure the bumper assembly to the body. They often corrode and break. Complete bracket kits include bolts, washers, and spacers. Check that your kit includes all necessary hardware—some aftermarket sets omit the rubber isolators that prevent rattles.

Material Options: Pros and Cons

Steel - Original Toughness

Factory steel components are strong and durable. But they rust, especially in salt-belt cars. If you're keeping the car original, search for NOS (New Old Stock) or reconditioned steel parts. They can be painted or powder coated for protection.

Aluminum - Lightweight and Rust-Free

Aluminum replacement bars and brackets are popular for weight savings. They never rust, but they can crack under extreme stress. For a street-driven 1977 911, aluminum is a safe choice if the component is properly designed.

Fiberglass / Polyurethane Covers

Fiberglass covers are lighter and cheaper than OEM plastic. They require careful painting and may need minor trimming to fit perfectly. Polyurethane covers are the closest to OEM feel but are heavier and more expensive than fiberglass. Both materials are available in blank or pre-drilled versions.

OEM vs Aftermarket: Which Should You Choose?

Original Equipment Manufacturer (OEM) parts are made by Porsche or licensed suppliers. They offer perfect fit and finish but can be expensive and hard to find. NOS parts are original but may show age.

Aftermarket parts vary widely in quality. Reputable brands like Dansk, OMP, or specific Porsche restoration shops produce parts that meet or exceed OEM specs. Budget brands may require modification. Always read descriptions carefully—some fiberglass covers are sold without mounting holes or with incorrect curves.

For a concours restoration, stick with OEM or premium aftermarket. For a driver or restomod, quality aftermarket parts offer good value.

Compatibility and Fitment Tips

Not all parts labeled "1977 911" fit perfectly. Differences exist between coupe vs. Targa (the Targa has slightly different bumper brackets due to the rigid roof structure). Also, US-market and RoW (Rest of World) bumpers differ: US cars had larger impact absorbers and different brackets. If your car is a grey-market import, verify part numbers.

Before ordering, measure your existing bumper mount locations. Check for corrosion on the mounting points on the body. Remove old parts carefully—screws often seize.

Where to Find Parts (Without Naming Marketplaces)

Start with reputable Porsche restoration suppliers. Many specialize in 911 parts for 1965-1989 models. Local Porsche clubs often have members selling used parts. Vintage salvage yards occasionally have intact rear bumpers. Online forums (like Pelican Parts, Rennlist) have classified sections. Always ask for photos and condition details.

Installation Considerations

Replacing a rear bumper cover is a straightforward job for a DIYer: unbolt the old cover, transfer any trim or lights, install the new cover with new hardware. Impact absorbers and reinforcement bars require more effort—you may need to loosen the bumper mounts from inside the trunk. Use new fasteners and anti-seize compound. For hydraulic absorbers, bleed them properly if they are serviceable.

If you're replacing the entire assembly, consider replacing the rubber trim strips and any cracked plastic light housings while the bumper is off. This saves labor later.

Final Recommendation

For a 1977 Porsche 911 that is driven regularly, focus on safety and fit. Choose a polyurethane bumper cover for durability, pair it with a new aluminum reinforcement bar, and replace foam absorbers with new original-style foam or converted hydraulic units. Use stainless steel or zinc-plated hardware to prevent corrosion. If originality is critical, source NOS steel parts and have them media blasted and powder coated. Always buy from a seller that allows returns of ill-fitting parts. Measure twice, order once.

Restoring your 911's rear bumper not only improves appearance but also ensures the car remains structurally sound. With the right parts and a bit of patience, you can return that rear end to its classic glory.