Anyone use a torsion my. crossmember Cap?

Looked at a Dart Sport today I'm considering buying if I can get the price down. It needs some floor pan and rocker repair. I crawled under and the torsion crossmember looks sound (on the outside anyway) but I think while the sheet metal is being repaired it might be wise to do some preventative work on the crossmember. Has anyone ever used the left and right reinforcement caps?
1968 Plymouth Barracuda Parts | MM8148 | 1960-76 Mopar A-Body Torsion Mount Frame Repair Cap; LH | Classic Industries