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Can't help with the hinge but I pulled one of the bolts out on mine and it was 10-32 by 3/4" long. I ordered a bunch of stainless ones from these guys who are also on ebay.
http://www.albanycountyfasteners.com/Hex_Serrated_Flange_Bolt_Stainless_Steel_10_32_p/12020000.htm
I haven't put them in...