Hi Bob
I have a Ford paper bag that has the # 352733-S100 and came with 5 Washer to the bag. I got 4 about 2 weeks ago, I took 1 out and compared it to the one off my 1967 Shelby 659 and is identical. They are flat, I figured when you put it on the bolt and tighten it down it would form to the bolt and rear end housing.
I have a Ford paper bag that has the # 352733-S100 and came with 5 Washer to the bag. I got 4 about 2 weeks ago, I took 1 out and compared it to the one off my 1967 Shelby 659 and is identical. They are flat, I figured when you put it on the bolt and tighten it down it would form to the bolt and rear end housing.