Frame Connectors

All these products are going to get nothing but more expensive as steel prices continue to climb.

My steel cost on projects is roughly 2-2.5x what it was about 3 years ago.

Another option is 1-1.5" .083 round bar. Cut 4 lengths and make a light bend around the floor pan, weld 2 pipes together. Box for the rear frame, and a 2"x6" .125 plate for the front mount. Pretty easy to make and relatively cheap compared to what the bolt ins cost. Just as effective.

The us car tools are flimsy until you weld them to the floor creating the "box" shape/member. Any U-channel is going to be more flimsy than a comparative boxed steel member of similar size. From a design standpoint, the floor being used as a structure plane is far superior to the 2x2 or 2x3 box tube that isn't attached to anything but the torsion x-member and rear frame stubs. I have a set of US car tool connectors that I haven't installed yet, not even out of the box, on a Duster. I usually build my own out of 2x3 .125, but, got the US pieces in a parts trade from John which worked out fine for both parties.