If you are familiar with some brand of cars, it is a matter of researching and reading what you know but need to apply to a different brand. I did a simple mopar rear end dimension search and found this information and picked it because I have seen it from the magazines themselves. There is a ton of information with the magazine, by the way, including all the K member information, disc brake swap stuff, you name it. There are lots of people that like to show you the information they have or found and compiled, so suggest, as an idea, do some internet searches and comparison articles to verify (not everything on the internet is good), but two or three articles talking about the same thing is usually pretty reliable. As far as Dr. Diff goes, I think shopping around a little bit would be a good idea. Granted it is a new rear end housing and all, but you should be able to save some money on a used one. The pumpkin does fit all the 8.75 housings no matter what car they came out of. I would hit a few junkyards in the area, craigslist, ebay if you like that, used cars (ones with no title can have a lot of good parts, so get a good bill of sale and scrap what you can't use or sell), be creative.