Z32 - another brake question

[Rittmeister]

OK, solved the riddle about which bolts to use to attach the Z32 caliper to the S13 spindle.

This is for a 30mm iron caliper.

NOW, I need to know where I can get the bolts that actually hold the two halves of the caliper together. I bought some calipers here on the forum and they showed up partially disassembled, and a couple of those bolts are missing. They're about 3" long, I measured the threads at 10x1.25 (I think), and take a 14mm socket.

I checked my local hardware, which is actually a mecca for metric stuff, but struck out. The closest bolt had the right threads and shaft length but a 17mm head, and I'm afraid they won't fit properly. They're also not coated at all, so I'm sure they'd rust quickly. Did some searching here and came up with a McFadden-Dales, which doesn't exist in my area.

A call to the dealer determined that these particular bolts aren't listed separately from the calipers. My parts guy is going to do a little digging, but if anyone could either tell me where I could get the right bolts, or what other bolt somewhere else on the car is the same, it would be greatly appreciated.

Thanks!