I was hoping to get the actual dimensions so I could just order the hardware itself rather than get "subframe collars". You can get that type of washer or bushing or whatever they are called for pretty cheap.
But, then I started talking to Josh at KDMTuners about suspension setups and tightening up my steering and he said I would be better off with a 2-point brace than with subframe collars. From their testing they didn't think the collars were even effective enough to sell. So, I went with the brace. The steering now feels much better. The only issue is I lost a little ground clearance.
I think I got my rear torsion bar from kdmtuners and my 2 point brace from pierce.
kdmtuners, evilla, and pierce all work together from my understanding and are all located in the same area. So I don't know if those parts are any different.
My Evilla rear torsion bar came with a pierce sticker... lol
If you aren't a current kdmtuners subscriber I can send you a referral code and I think you should get $5 in store credit with them.