The cooling fan is one of the most important and overlooked components in the air cooled engine. Bent or cracked fins, worn hub or out of round fans can cause severe damage to your engine. The late style factory fan is wider than the early version and is compatible with any EMPI fan housing and stock Type 1 & 2 Doghouse fan shrouds and Ram-Air Fan Shrouds. P/N: 98-2004 fits all EMPI 36HP style fan shrouds along with 71 & later stock Doghouse fan shrouds. 98-2004 FAN, w/o Hardware 34.7mm Inner Fan Dia. / 36.9mm Outer Fan Dia. Check out my other items!