Does anyone make weld in Subframe connectors for a 108WB 67 Fastback

I am putting in a set of US Car Tool sub-frame connectors in my 71 Barracuda. I spent about 30-45 minutes yesterday to get one side to fit nicely enough to weld in. I had to mark and grind a few spots off several times for it to fit. I think that is pretty good. I think they fit close enough to weld at least 90% of the length without any trouble. The rest may take a little more effort, not sure if I will worry about it though. The other 10% may just require someone on the inside to push down a little. They should really strengthen the whole structure.