Restoring the Interior of a 1978 Porsche 911 SC: A Guide to Key Parts and Sourcing

Restoring the interior of a 1978 Porsche 911 SC is a rewarding project that can dramatically improve the driving experience and preserve the car's classic character. Whether you are refreshing worn components or returning the cabin to original condition, knowing which parts to prioritize and how to choose quality replacements is essential. This guide covers the most common interior parts for the 1978 911 SC, including seats, carpets, dashboards, door panels, headliners, and trim, with practical advice on materials, fitment, and sourcing.

Seats: Front and Rear

The front seats in a 1978 911 SC are often the first area to show wear. Original seats came in either vinyl or leather, with perforated or smooth inserts depending on the model. For a restoration, you have three main options: OEM new old stock (NOS), high-quality reproduction upholstery kits, or custom reupholstery using original-style materials. NOS seats are rare and expensive, so many owners choose reproduction seat covers that match the original stitching and grain. For the rear seats, which are essentially small bench seats, reproduction covers are also available. Pay attention to the material – correct leather or vinyl should have a slightly matte finish, not glossy. If you are keeping the original frames, check for broken springs or foam deterioration. Rebuilding the seat foam with modern materials can improve comfort without altering the look.

Carpets and Floor Mats

Carpet sets for the 1978 911 SC are available in loop or cut-pile styles, with colors matching the factory palette (black, brown, red, tan, beige). Original carpets were typically loop pile for durability. Reproduction carpet sets are widely available and come pre-cut with heel pad reinforcements. When ordering, specify whether your car has a manual or automatic transmission, as the tunnel shape differs. Floor mats are optional but protect the carpet; original-style rubber mats with the Porsche crest are a popular choice. For a factory-correct look, choose carpet with the correct backing and edge binding. Many suppliers offer kits that include all pieces for the front and rear cabin, plus the luggage compartment.

Dashboard and Instrument Panel

The dashboard in the 1978 911 SC is prone to cracking from sun exposure. A cracked dash can be repaired with a dashboard cover or replaced entirely. Replacement dashboards are available in both original hard plastic and leather-wrapped versions. Hard plastic dashes are closer to the factory finish, while leather adds a touch of luxury. Make sure the replacement has the correct cutouts for the instrument cluster, glove box, and vents. The instrument panel itself (the binnacle holding the gauges) often fades or cracks; replacement panels can be found in black or matching interior colors. Gauges can be refurbished or replaced with new units that maintain the classic appearance but offer modern internals for better reliability.

Door Panels

Door panels on the 1978 911 SC are typically made of vinyl over fiberboard. Over time, the vinyl can shrink, the foam backing can deteriorate, and the fiberboard can warp. Reproduction door panels are available in most original colors and materials. They come with the correct chrome trim, armrests, and door pull pockets pre-attached or as separate parts. Before replacing, check the condition of the door shells and window seals, as leaks can damage new panels. When installing, use new clips and ensure the vapor barrier is intact to prevent moisture buildup.

Headliner

The headliner is often overlooked but plays a big role in the interior's appearance. Original 911 SC headliners were woven cloth in a light color (usually tan, beige, or off-white). Replacement headliners are sold as kits with pre-sewn seams and cutouts for the sunroof (if equipped). Installation is tricky because the headliner must be glued to the roof panel; professional installation is recommended. Aftermarket headliners use modern materials that are more fade-resistant than the originals.

Steering Wheel and Shift Knob

The three-spoke steering wheel on the 1978 911 SC is a defining feature. Original leather-wrapped wheels can be re-covered or replaced with a new unit. For a period-correct look, choose a wheel with a thick, flat leather rim and a center horn pad with the Porsche crest. The shift knob should be a leather-covered unit with an aluminum or black base; original-style knobs are easy to find. If your car has a manual transmission, also consider replacing the shift boot.

Trim and Miscellaneous Parts

Other interior parts include the center console (often cracked plastic), ashtrays, door sills, and trim pieces around the windows and seats. These can be found as reproductions or refurbished originals. Interior colors and material codes are stamped on the vehicle identification plate; matching these codes ensures correctness. For example, code 23 means black leatherette, while 24 is black leather. Use these codes when ordering parts to avoid mismatched shades.

Sourcing Parts: Quality and Authenticity

When sourcing interior parts for your 1978 911 SC, prioritize suppliers known for accuracy. Many specialty retailers offer parts that are “factory correct” in materials and dimensions. Avoid cheap generic parts that may fit poorly or use incorrect materials. For leather goods, ask about the hide quality and whether it matches the original texture. For carpets, request samples to compare the pile and color. NOS parts can be found through classifieds or specialty shops, but inspect them carefully as age can cause brittleness. Aftermarket restoration parts have improved significantly in recent years and are often the most practical choice.

Final Recommendation

For a 1978 911 SC interior restoration, start with the seats and carpets — they have the biggest visual impact. Invest in high-quality reproduction seat covers and a full carpet kit. Replace the dashboard if cracked, and refresh the door panels and headliner. Use original color codes to ensure everything matches. Focus on materials that hew closely to the factory specs, as this preserves the car's authenticity and value. Professional installation is recommended for complex items like the headliner and seat covers. With careful selection, your 911 SC’s interior will look and feel like new, honoring the original design while providing reliable service for years to come.