I have the same set up. I bought a 1 1/4 Cold Rolled solid bar from the local metal shop. I have done over 10 housings over the years. All of them were bent on the right (curb) side. At 200 a pop to narrow, it paid for itself quickly. I actually made the 8 3/4 pucks from aluminum stock when I worked in a machine shop. The one on eBay I bought for the Ford 9". They are super easy to use. I can narrow a housing in an hours time.
