If your going to us a differential, just mount it on upside down or roll it over in the housing, i appreciate this sounds easier than it is, but that is as easy as it could be........ *grins* but i am guessing it wont be. There is a 500 double busa i will try n get some pics, although it is so far from original, if you can keep it looking the same it'll be quiet something, cheers
neal