I dont expect this to fit every car.And I have no intention of doing all the leg work to come up with one that does.I merely copied a proven design (by some) and , in my opinion made it a little cleaner. Ther are so many hybrid combinations between tranny's and diffs that a one size fits all pobably doesnt exist. As for a weld it yourself kit, the reason I made this was to get rid of all the welding involved on the original design.That one consisted of 6 parts, I dropped it to 2. If thats what your looking for, you should just stop by a local shop and have them shear up some blanks for you and weld up your own.If you feel that the originaly sized part will fit your car and your interested in what Ive done, let me know.Thanks for your inputs