Need advise on Sub frame connectors

Back in the late 80’s there was a company that made these. Either bolt in or weld in and they were as simple a a piece of steel box tubing 1-1/2” x 2-1/2” 1/8” wall and a flat plate with 2 @ 5/8” holes (torsion bar side) and a box welded to the end to wrap around the beginning of the rear frame rail. 2@ 5/8” holes with pipes that fit into the frame. Competition Engineering was the company. Again pre internet or camera phones. They were simple and worked fine. Now they could be hand build over a weekend and painted and installed.
In this world of “buy everything.” Some times it is fun to build your own.
Good luck on your search.
Syleng1