I got mine on ebay from a guy in Thailand! He is American and sends them very fast. He is not selling on ebay at the moment but if you go to www.gasketstogo.com he should help you. HTH Peter.
Don t forget there is an MD1 and an md1A I think the MD1 only has 4 head studs but the MD1A has 4 big head studs and 2 smaller near the push rods. The bores are different and so are the head gaskets. Be sure to order the correct one. The Thai ones are to the original spec and seem to have more resiliance than the later ones.