So, while doing the head on my van (1990 2WD Westy), I was able to 'safely'
remove the header bolts and nuts between the exhaust and head. Of course,
these are one-time use hardware. Aside from just using 12 and 13mm nuts and
bolts, can anyone recommend good quality hardware that will stand the test
of time to use on the exhaust system so the next time I have to remove them
for whatever reason, that I have a better chance of safe removal?

Thanks,
Gregg