I have an 87 Softail custom and I am trying to figure out the correct main shaft Maine primary shaft diameter coming out of the transmission into the inner primary case I bought a new race and it´s slips on it doesn´t press on like it should and I thought I read that there might be a different size race that goes on and 87 and early Evo than it does a late-model Evo but I haven´t been able to find any Dimensions saying so