FIA style wheel set of 4 wheels 6 pin 2 x 15 x 7.5 backspace 3.3 2 x 15 x 9.5.backspace 3.5 To suit hubs with 6 pins of 1/2 inch diameter 1 inch length. pin circle 6 on 4.25 inches. Spigot diameter 3.0 inches To fit CSX series, Will also work on ERA, Contemporary,other cars with 6 pin hubs (may require backspace adjustment ,please call 1888 339 7572 for more information)