I have a narrowed limited slip Ford 9" that I had under my V-8 Toyota project. I have been parting the truck out. It is narrowed to stuff 20x10 Prowler wheels under the back of the Toyota laying body.
Yes its a direct swap as long as you are using 4cyl type rearends. I found this stuff a while back when I trashed the differential in my truck. I had a good diff. in my 4wd parts truck, swap was easy.