Provider = Gr8ful312. I bought these heads on Ebay. These guys not only delivered my Detroit Diesel cylinder heads fast but Steve, who has worked on these engines in the past, made certain ALL the parts were there. This included cylinder head bolts, fuel racks, rocker covers, complete valve trains and injectors. They maintained very good communications throughout the process. I couldnt have picked them up myself for the $100 they charged me to deliver them, plus it would have taken me 2 days to go get them. Great service. Uship comes through one more time!!!