I second McMaster Carr if you don't have a good fastner store near you, whatever I can't get from my local store, I get form McMaster Carr, they have everything you could possibly think of. I use mostly yellow zinc grade 8 fastners in my engine builds, even in the places where a grade 8 fastner is overkill, because the grade 8 hardware at my source comes in yellow zinc or cad and I like the way it looks, I paint all the exterior engine pieces separately so I can show off the grade 8 hardware.