I don't know if this has been brought up, but for those of you saving up ur nickels & dimes for either the HR or GMP alloy knuckles here's a quick fix for the stock plastic ones. I had excessive play (about 3/4") on my left rear. Went down to the local Ace hrdwr store & got some O-rings 1/4OD 1/8ID. popped the retainer caps off & dropped the o-rings in & reinstalled the caps. no more play. sorry don't have pics. not sure how long it will last, only ran it one day before the weather turned.