FC3S vs FD3S Carbon Fiber Door Sills

Quick answer

Both FC3S and FD3S carbon fiber door sills replace dull plastic with a woven composite, but they differ in weave choices and logo options. The FC3S set offers three weaves and a period-correct MAZDA logo, while the FD3S set adds a fourth weave and an RX-7 logo with style options.

Trade-offs at a glance

• Weave variety: FD3S sills give you four weaves; FC3S sills give you three. If you want the widest weave selection, the FD3S set wins. For most FC3S owners, three weaves still cover the popular looks.
• Logo authenticity: FC3S sills use a period-correct MAZDA logo, while FD3S sills use an RX-7 logo with style options. The FC3S logo better suits a restoration, while the FD3S logo offers more personalization.
• Installation method: Both use 3M molding tape for a clean bolt-on fit. No drilling or permanent modification is needed, so you can revert to stock if you sell the car. Either set installs in about 15 minutes with basic hand tools.

Product details

• Mazda RX-7 [FD3S] Carbon Fiber Door Sills: Offered in four carbon weaves and multiple RX-7 logo colors and styles. More customization choices let you match the weave to your existing carbon parts and pick a logo that fits your build's personality.

  

• Mazda RX-7 [FC3S] Carbon Fiber Door Sills: Available in three carbon weaves with a period-specific MAZDA logo in multiple colors. The authentic MAZDA logo keeps the FC3S interior looking era-correct, which matters for restoration or period-themed builds.

  

Which set fits your build?

Best for

• FC3S owners who want an era-correct MAZDA logo and three weave options
• FD3S owners who want the most weave choices and an RX-7 logo with style flexibility

Not for

• Other RX-7 generations or non-Mazda vehicles – these sills are model-specific