Ah...forgot about those bolts, although wow seems so small.
Anyway, if you know somebody with a mcmaster-carr account, they sell them and I'm sure Grainger does as well (anybody can buy from them, I believe)...otherwise, more than likely you'll need to find something online that sells small qty., or maybe HKS, etc...that is sort of an oddball size that I highly doubt you'll find at a neighborhood hardware store (esp. a chain)...you *may* be able to find something at one of those mom and pop style that sells a lot of different hardware.
I have a lot of hardware in metric, stainless, etc., but don't think anything in that size...I'll double check tho.
EDIT - the longest ones I have are 60 mm, but they are new...don't think that's be near long enough.
btw - an alternative is to get some M8-1.25 studs and nuts, etc., fwiw.