Mounts to Rugged Ridge Sparticus HD tire carrier and pan hinge. As many others have said, the direction is terrible! The HD Sparticus Carrier has two bolts, but the instructions don't say that. Found this in Revain's answers. Using a 48" MAASDAM socket I had to replace the 6" prop with a smaller 4" base. No matter how much I played and adjusted my jack, it never fitted properly. Jack can't slide all the way back and the sock doesn't quite hold it. All of the above aside, I am satisfied. The jack and bracket does not wobble or rattle at all! Very solid on my jeep. I would buy this item again and recommend it.