Has anyone successfully used the USCartool A500 Crossmember?

It's good to know that the hole you cut in the floorboard so you could watch the crossmember while you drive didn't affect the rigidity, either. ;-)

No hole in the floor here.
I just cut out the hump in the loop above the trans and left the two remaining straps.
Welded in .085 wall 2x3 frame connectors help support the torsion bar support part of the equation.