alternative pressure plate bolt source?

[auditude at get.net]

As some of you know, I busted off a pressure plate bolt while following the wrong
torque specs that are in my early single book 5kcstq Bentley.  (btw, is the typo in the
later, 2-book version too?)

Would it be okay to get a similar allen bolt from a hardware or fastener store?
Should these things be able to be found by the specs?  Grade 8.8, metric, etc.

There's that option, and also reusing "one" of the old ones I took out.  The rest are
new.

I have this Friday off, and it would be nice to get the thing back together during the
three day weekend, rather than wait for another shipment from Carlsen.  The local
Audi dealer, Scottsdale, hasn't had that kind of stuff in stock in the past, so I won't
even bother asking them.

I guess I was lucky the bolt broke instead of the flywheel stripping out.

Thanks for any help.

Ken