1977 Porsche Rear Bumper Parts: A Practical Guide

Restoring or repairing a 1977 Porsche often involves the rear bumper, a component that takes a beating over time. Whether you own a 911, 924, or 928, finding quality rear bumper parts for a 1977 model requires understanding what’s available and what fits. This guide covers the main parts, material choices, and practical tips for buying and replacing them.

Understanding Your 1977 Porsche Rear Bumper

The 1977 model year saw several Porsche variants, each with distinct rear bumper designs. The 911 used a chrome bumper with rubber impact strips, while the 924 had a more integrated plastic bumper. For the 928 introduced in 1978, the 1977 models are not applicable, but some parts share. The rear bumper assembly typically includes the bumper bar (the main metal or chrome piece), the bumper guards (or overriders), rubber trim or impact strips, mounting brackets, and sometimes a valence or filler panel. Knowing your exact model is crucial before ordering parts.

Common Rear Bumper Parts That Need Replacement

Bumper Guards (Overriders)

These are the rubber or metal protrusions on the bumper. On a 1977 911, they often crack or fade. Replacement guards come in black rubber or chrome-plated metal. For the 924, integrated plastic bumpers have smaller guards.

Rubber Impact Strips

Early 911s have a rubber strip running along the chrome bumper. These dry out and crack. Reproduction strips are available from specialty suppliers.

Mounting Brackets

Rust is a major issue with steel brackets. If your bumper sags, check the brackets. Aftermarket brackets are typically made from heavier gauge steel.

Bumper Shocks or Absorbers

Some 1977 models (like the 911 with impact bumpers) use energy-absorbing units behind the bumper. These can leak fluid or lose pressure. Replacement shocks are available, but some owners convert to rigid mounts for a cleaner look.

Chrome Bumper Bar

The main bumper itself. If dented or pitted, rechroming is an option but costly. Aftermarket bumpers in chrome or stainless steel are available for the 911. For the 924, the plastic bumper is often replaced entirely.

OEM vs Aftermarket Parts: What to Choose

Original Equipment Manufacturer (OEM) parts are exact reproductions of Porsche factory parts. They offer perfect fit and material quality but come at a premium. Aftermarket parts vary widely. For a 1977 Porsche, some aftermarket parts are high-quality, especially from brands like Stoddard or Pelican Parts. Others may require modification. If you’re doing a concours restoration, OEM is preferable. For a driver-quality car, well-reviewed aftermarket parts can save money. Always check return policies.

Material Options: Chrome, Rubber, and More

Chrome Bumpers

Classic 911s look best with show-quality chrome. Triple-plated chrome is the standard for reproduction bumpers. Stainless steel is an option: it won’t rust and doesn’t require polishing as often, but it has a slightly different sheen.

Rubber and Plastic Trim

For 911 impact strips, rubber is the only original choice. Some aftermarket strips are made from flexible PVC that lasts longer than original rubber. For 924 bumpers, original plastic is available, but many owners upgrade to a fiberglass or carbon fiber bumper for weight savings.

Aluminum and Composite

Some aftermarket bumpers use aluminum or fiberglass. These are lighter and resist corrosion, but they may not be as strong in a minor collision. Composite bumpers often require painting.

Fitment Considerations for the 1977 Model Year

1977 911s were transitioning from narrow body to wide body (Turbo look). Rear bumpers differ: narrow-body cars have a shallower bumper, while wide-body cars have a deeper bumper that matches the flares. If you have a narrow-body 911, a wide-body bumper will stick out. Similarly, 1977 924 bumpers have a specific profile that changed in 1978. Always confirm your car’s VIN and production date. Parts suppliers often ask for these details to ensure correct fitment.

Tips for Buying Rear Bumper Parts

• Buy from specialists: Companies like Pelican Parts, Stoddard, and Sierra Madre Collection have decades of experience with 1977 Porsches. Their staff can guide you to the right parts.
• Check for hardware: Many kits come without bolts, nuts, or rubber grommets. Make sure you have a complete set or order separately.
• Consider pre-assembled units: For the 911, some suppliers sell the bumper with impact strips and guards pre-installed, saving you assembly time.
• Beware of cheap reproductions: Thin chrome or soft rubber will not last. Look for parts with a warranty.
• Rechrome vs. new: If your original bumper is straight, rechroming can be cheaper than a new reproduction. However, rechroming takes weeks and may still hide pitting.

Installation Overview

Replacing a rear bumper on a 1977 Porsche is a moderately difficult job. You will need basic hand tools: wrenches, sockets, and a jack to support the bumper. The process generally involves:

1. Disconnect any wiring for license plate lights or fog lights.
2. Support the bumper from below with a padded jack.
3. Unbolt the mounting brackets from the body (often behind the rear wheel wells).
4. Slide the bumper off.
5. Transfer any reusable hardware or sensors to the new bumper.
6. Reverse steps to install.

A service manual for your specific model is invaluable. For the 911, the impact absorber units need careful alignment. For the 924, the plastic bumper may require drilling for fog lights. If you are not comfortable, a professional Porsche shop can handle the swap efficiently.

Final Recommendation

For a 1977 Porsche, prioritize safety and fit. If you are restoring to original spec, invest in OEM chrome bumper parts from reputable suppliers like Stoddard or Restoration Design. For daily driving, aftermarket stainless steel bumpers offer lower maintenance. Always verify your model specifically—911 narrow or wide body, or 924—before ordering. Join a Porsche forum or ask a parts specialist to avoid costly returns. Keep the original hardware if it is in good condition, and consider replacing rubber items and bumper absorbers at the same time to save labor. With the right parts, your 1977 Porsche’s rear bumper will look great and protect the car for years to come.