Pav-Tek sourced my gasket,when they built the engine....so I can't help there.I'd imagine Ridgecrest or similar would be able to whip one up. I've seen FJ24 head gaskets available from somewhere,but like an idiot,I didn't write down where it was.......Try stew wilkons maybe?
and yes,my motor is o-ringed,if that's what you mean?