"This polished aluminum spacer kit is a necessity with a wide tire Hardbody frame when used with fL, FX 1973-1983 rear wheel hub. The 1.090"" thick polished spacer properly aligns drive line components and reduces wear and tear on belt or chain drives. The kit is complete with mounting hardware. Fits FL, FX 1973-1983 rear wheel hubs and all wide tire Hardbody frames."