Anybody out there aware of an upgraded aftermarket replacement for the stock rear suspension bushings - pivots at the rod and some shock ends. Mainly the aluminum bushings with teflon/plastic coating (I think the rear skid requires 5 of them) They seem to wear out quickly. All of mine are separated and worn thru the teflon into the host leaving lots of play (1000 plus miles). Seems like some made of tool brass would wear better. Small detail i know but just curious.