So I'm in the process of building my TT from ground up. I got my TT calipers and I need to find bolts to actually mount then to the hub. Besides 3SX where can I get a set of these?

I am also missing one of the bolts that actually holds the two halfs of the caliper together! Thee are four bolts that hold the front part of the caliper to the back. I am missing one of those bolts. All local hardware stores don't carry anything that long. I can't even find the bolt in the manual or CAPS!