Fan is NOT needed when converting from Delco to Bosch. 8.0" DE mounting hole distance.The 8301316 Alternator - New, 12V, 160A, Aftermarket Bosch fits equipment brands such as: AGCO, Allis Chalmers, Case, Case IH, Caterpillar, Challenger, Gleaner, Massey Ferguson, New Holland, Valtra, Versatile, White