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.

What they share

Both sets are true bolt-on replacements that use 3M molding tape for installation. Each covers the factory door sill area with a real carbon fiber layer, upgrading the look every time you open the door.

Where they differ

The FC3S set comes in three carbon weaves (including Twill 2x2) and offers a period-specific MAZDA logo in several colors. The FD3S set adds a fourth weave option and an RX-7 logo with additional logo style choices, giving you more room to match your interior theme.

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 FD3S Carbon Fiber Door Sills

    Mazda RX-7 [FD3S] Carbon Fiber Door Sills

  • 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.

    Mazda RX-7 FC3S Carbon Fiber Door Sills

    Mazda RX-7 [FC3S] Carbon Fiber Door Sills

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