I was told that you could use a 99-04 mustang independent rear suspenion in vintage mustangs? I have a 68 fastback and found a complete independent rear suspenion out of a 03 cobra. Will this suspension fit under a 68 fastback or would it be to big of a hassle. I wanna do away with the leafs and other rear coilover suspensions are like 5 grand and I found a good deal on this complete cobra setup. please help. thanks guys