Just installed on my 2020 JWU Rubicon. Yeah... that space up in there is tight. But with a bit of contortion and patience, it's manageable.
This forum is two for two on recommended mods. First the spacer under the front seat bolts for more lower cushion rake, and now this nifty little gizmo...
Thank you for this thread. This adjustment makes my seat SO much more comfortable for me. I have shorter legs and a longer torso. I'm more of a sports car guy, and I really like a bit of under thigh support in my seating. A 7/16" collar made a world of difference. Brilliant!