How many different types of this adaptor exist?? Think they make a short and tall, but what about different thickness?? Reason I ask, I just tried to put my t-case in, and only went on about 2-3". I have a 2wd TH400, said adaptor, and a 2" spacer to match with the Ford 205. It looks like a 400/205 for a GM case is the right thinkness, so looks like I'm gonna havta hit the yard and look for a thick adaptor???? SOOOOO close to getting this thing going again!!!!!