track(metal) and sprockets are original. i bought 3 c sprue (bogies and return rollers), suspension arms, idlers, road rubber, bearings and bushings. perfect install, idlers were a bit longer than original but were within the adjustment range but everything fit as I expected. thanks for the confirmation about the pins. don't think i'll change it any more than that for now. to much moolah to go full option. it's cheaper to buy a new one than the parts.