My generosity knows no bounds...........
Discussion
These are apparently called JIS (Japanese industrial Standard) bolts.
These particular ones are M8 with a 10 mm head (13 is normal), I find them far better for bolting the exhaust manifolds to the heads, you can actually get a ring spanner on all of them.
These four are un-used (that's Copaslip on them) and I also have a dozen used, finish has dulled but quite usable.
free to a good home, ideally someone coming to Scotland or you pay the postage

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Sounds a bit fishy to me, Mike. 