Maybe a bit late now, but it might have been easier to order the engine seal kit. I bought one, it has over 100 pieces to it (according to the description I have here), everything from head gaskets to water pump gaskets and more o-rings than I can shake a stick at. The only problem is they're all thrown in together, so you'll need to figure out which of the 15 or so o-rings is needed at the time.
I think the kit was around $200.