I ordered a mounting hardware kit for the rear shock that's going on my MTB frame. The kit was specific to Rock Shox. I'm wondering if I also need to get new bolts (they may be worn, and it would be nice to have a spare in case I stip the threads on one). Where do I find such bolts? I know they are M8 thread, and I can measure the length I need, but where can I get bolts that are sufficiently strong for this application?