i know it is not the same but on my 98 Z71 i swapped in a 6 lug 14 bolt after i blew up my 10 bolt. and i was told the same thing about the ujoint, however when i brought it to the driveline place they told me they don't make those ujoints anymore. so they took my old driveshaft and welded a bigger yoke on the end of it. after it was re-tubed, welded, and balanced, it ended up costing alot more than i wanted to spend. oh well it was worth it in the end.