Sub frame connectors

I was talking about the home made type that don't weld to the floor OR the prefabbed ones that do.
My Brother and I made mine with .085 wall 2x3 box steel that are not welded to the floor.
The 1x little baby bolt in type I don't care for.
Here's what we did that cost about 50 bucks and took a couple of hours.

View attachment 1715167952

I just bought 1.5x3 .125 rectangular tubing to make a set for my 68 Dodge Dart. I appreciate you posting the diagram as I'm doing a similar design. I am curious though, was your car a Dart Sport aka Demon? Unless the 73 Dart coupe body style really shortened up the underside my 2 door 68 Dart coupe (not a post car) needed 50 inch long pieces not 40~ inches.