The Formula GT Wheel feature a hand-stitched leather-grained vinyl grip. The Formula GT is a 3-spoke design with machined racing holes. This has been one of our most popular and endearing designs since it was first introduced in the mid 1970s. A Grant Installation Kit is necessary to mount this wheel to a vehicle. This wheel will work with Grant Standard 3000 or 4000 Series, Billet 5000 Series, or Euro 6000 Series Installation Kits.