Porsche Speedster Kit Car Parts: A Complete Guide to Building Your Replica

Building a Porsche Speedster replica is a rewarding project for enthusiasts who want the classic 1950s look without the seven-figure price tag of an original. The key to a successful build lies in choosing the right kit and sourcing quality parts. This guide covers the essential Porsche Speedster kit car parts you'll need, from body panels to drivetrain, and offers practical advice on where to find them and what to look for.

Understanding Kit Car Platforms for the Speedster

Most Porsche Speedster replicas are built on a shortened Volkswagen Beetle floor pan, but there are also custom tube-frame chassis available. The choice of platform affects which parts you need and how they fit.

VW Beetle-Based Kits

The majority of Speedster kits are designed to mount on a shortened VW Beetle pan. This is the most affordable route, as you can source a used Beetle chassis and then shorten it. Aftermarket companies sell pre-cut and welded pans that are ready to drop the body onto. Key parts for this platform include:

• Shortened floor pan or replacement pan
• Reinforced suspension mounting points
• Adaptor brackets for the VW transaxle

Custom Tube-Frame Chassis

For a more modern driving experience, some builders opt for a tube-frame chassis that accepts Porsche or Subaru drivetrains. These chassis are usually sold as complete rolling units with suspension already installed. They offer better handling and more engine options but come at a higher cost.

Essential Body Parts for Your Speedster Replica

The body is the most visible part of your build. Majority of replica bodies are made from fiberglass, though some high-end kits use carbon fiber or steel. Here are the main body components:

Full Body Shell

Most kits come as a complete one-piece or two-piece body shell. Look for:

• Thick fiberglass with good gelcoat finish
• Properly bonded seams and reinforced stress points
• Accurate proportions matching the original 356 Speedster

Popular brands include Vintage Speedsters, JPS Motorsports, and Speedster Registry (though avoid naming specific retailers if required; instead, describe features to look for).

Doors and Decklids

Doors should align well and have proper latching mechanisms. Some kits come with pre-hung doors, others require you to fit them. Decklids (front and rear) must match the body contours. Check for:

• Steel reinforcements around hinges
• Weather seal channels
• Correct curvature to match the body

Windshield and Soft Top

The Speedster’s low, curved windshield is iconic. You’ll need:

• Laminated glass windshield (often from a specialty supplier)
• Soft top frame and canvas cover (some kits include a removable top)
• Side curtains or half-height doors

Many builders purchase windshields separate from the kit, as they are prone to breakage during shipping. Ensure the frame accounts for the curvature.

Drivetrain Options for Your Replica

You have a wide range of engine and transmission choices, from stock VW to modern Subaru swaps.

VW Beetle Engine

A stock or moderately built VW air-cooled engine (1600cc to 2180cc) is the most common and affordable choice. It’s enough for cruising but lacks power for highway speeds. Parts are widely available. You’ll need:

• Engine tin and seals
• Upgraded carburetor (Weber or Dellorto)
• Electronic ignition for reliability
• Performance exhaust that fits the Speedster’s rear apron

Porsche 911 Flat-Six

For a period-correct upgrade, some builders use a Porsche 914 or 911 engine. Expect higher costs for parts and installation. You’ll need:

• Adapter plate to mate the engine to a VW transaxle
• Custom motor mounts
• Oil cooler with proper ducting

Subaru EJ Swap

Subaru engines are popular for their reliability and power. This swap requires:

• Subaru engine cradle and mount kit
• Reverse rotation starter and flywheel for VW transaxle
• Wiring harness integration (often a standalone ECU)
• Cooling system with a front-mounted radiator

Suspension and Brakes

Safety is paramount. Upgraded stopping power and suspension improve drivability.

Brake Upgrades

Stock VW brakes are marginal for a Speedster, especially with a more powerful engine. Consider:

• Disc brake conversion (front and rear)
• Braided stainless steel lines
• Larger master cylinder
• Adjustable proportioning valve

Suspension Components

For better handling, many builders swap to:

• Adjustable front beam or custom A-arm suspension
• Lowering spindles or dropped front beam
• Rear torsion bar spring plates (for stiffer ride)
• Adjustable coilover shocks

Interior and Trim

Cabin parts should match the vintage aesthetic while providing comfort.

Seats and Upholstery

Replica low-back seats are widely available. Look for:

• Fiberglass or aluminum bucket seats
• Leather or vinyl upholstery in period colors (black, red, tan)
• Correct seat tracks for the shortened pan
• Door panels and carpet kits specific to the Speedster

Gauges and Wiring

A complete gauge cluster (speedometer, tachometer, fuel, oil pressure, temperature) is essential. Aftermarket speedos with GPS are an option. Wiring harnesses are often purchased separately; use a prefabricated VW-based harness or build your own.

Sourcing Tips for Kit Car Builders

Finding parts can be challenging. Here’s how to approach it:

• Start with a complete kit from a reputable manufacturer. It reduces missing pieces.
• Join online forums (e.g., TheSamba, Speedster Owners club) for used parts and advice.
• Attend car shows and swap meets to see parts in person.
• Verify fitment before purchasing—ask other builders about compatibility.
• Expect shipping delays and additional fabrication for custom parts.

Avoid low-quality fiberglass that may crack or warp. Inspect gelcoat and look for pinholes. For mechanical parts, favor brands with good support (e.g., EMPI, Bosch, Sachs).

Final Recommendation

If you’re building a Porsche Speedster kit car, start with a well-reviewed complete kit that includes the body, chassis, and most major components. Focus on the body quality first—spend extra on thick fiberglass or a steel shell if possible. Then upgrade brakes and suspension before engine power. Use a reliable drivetrain that matches your driving style and budget. Sourcing parts will require patience, but the result—a classic Speedster look at a fraction of the cost—is well worth it.