I'd still call 'em up direct and put them on the spot, "saw a set on Ebay for £130" and go from there. I got these gaskets from Ebay for £5, just make sure the flanges are clean and not caked with crud, any pressure on the gaskets with a screwdriver when trying to seat them and you'll put a big dent in them, they're only thin.
Eagles may soar, but weasels don't get sucked into jet engines...