hi and welcome to the forum i asumme you cant get it into the houseing you will need to match up the spilnes on the rubber dampers near enough then wiggle it into place while twisting it lightly dont pull the alt in with the bolts as you will cause damage
The instructions sayremove the passenger foot plate (two bolts) doesn't add much but makes iteasier to see.Insert the alt. back end first with the tab on the rear of alt. at 6 o'clockafter its in twist alt. sotab is at 5 o'clock. The alt. will be hitting tubing I think steel brake line. You will have to put some (force) pressure against that line and then turn it into place. This is from the instructions from my install.