Mazda RX-7 FC3S Carbon Fiber Door SillsPlease allow 6 8 week lead time when ordering carbon parts. Fall in love when you open your door and see a perfectly laid piece of carbon fiber covering your door sill. This is a true "bolt on" replacement for the dull stock plastic door sill. Not only that, every Carbon Fiber Door Sill set for the 1986 1991 Mazda RX 7 [FC3S] is offered in one of three awesome carbon weaves and a handful of colors for the period specific MAZDA logo. Available Weaves