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I bought a set of those bolts from Doc's House of Bolts (docsbolts.com) about 2 years ago, still haven't got them installed yet. They are stainless, with the washers, and allen heads but I think were flat, not the dome shape the heads of those bolts have. I looked on their website just now, but they're only listed in the cab kit. You still might try them to see if they'll sell just those for the hinges. I don't remember what I paid for them, but think it was 10-15 bucks for a set.
Scott, I did call docsbolts and asked for just the 12 bolts I needed for the cab and they had them available in an allen type head. I went ahead and ordered them and they said they will send them off today.
Cool, glad that worked out for you. I'm hoping on having my thousand pieces put back together this summer, so hopefully I can install my hinge bolts finally!