I've got the same thing...May not be Kentrol, but they fit in the hinge hole and have a screw clamp to tighten to the frame. Bout 40 bucks each I think. Quadratec had them IIRC. I like them just fine, easy in and out and they were still good after sitting in some pretty nasty water for a couple of months. They vibrate more than the door mirrors, but you get used to it.

97tj, Shaved Ford 9 rear, 4:10's, New 35x12.5 BFG KM2's to test!, Warn x8000i, ARB's, Quick Disco's, Hand Throttle, & it's my DD. smile