I bought a set of calipers from a R33 GTST from a guy on here and they only arrived with one set of caliper bolts.
Unfortunately I didn't realize it until I already had the passenger side finished. Because they are a larger bolt than the stock S13 240SX holes, I had to drill the existing holes out to get these new bolts to fit.
What size are these bolts and would I be able to source them from some place local?

Edit: looking some more, I've found a few places that say M12x1.25. Is this true? Any other vehicles that use this?

I would imagine the Z32 would use similar bolts.

My buddy has the R33 calipers on his 240 also, and we looked at them. His bolts are smaller than mine. Finally figured out that mine were M14 and I'm good to go now.
Not sure why my set is different than the rest.

There are several different castings. I never noticed there were differences in the bolts, but it seems there are.