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If the part you're looking for is the "caliper bolt", which is item# 4 in the picture above, it's GM Part# 14084015 and it's about $6.65 list price, and around $4.50 from a forum vendor.
If you're looking for the "caliper guide pin", then it's item# 6 in the picture, GM Part# 88955515 and costs about $43 list, about $33 vendor discount price.
Good luck, and double check those part#s before you order!!!
Bob
#4 is what i broke. think i might just order the #4 and #6 since peices of the #4 bolt is stuck in the #6
can't find anyone who carries p/n 14084015 , found some M8 1.25 10.9 bolts at advance auto, but they looked slightly different, gonna check ace tomorrow.