re caliper bolts. bit of trivia: they are the same size as wheel nuts, so if you lose one and the other is loose and you dont have tools with you - use the std holden wheel brace.
A tip: when replacing the brake pads and doing up the caliper bolts, The Book says to use new bolts. Why? Neweys have locking compond on them so they dont come loose. So use something (Loctite maybe?) to lock em on. i didnt do that - i am too smart you see - and learnt all of the above, the relatively (ie not the bush, thankfully), hard way. cheers!