I have a set of 70's production Econo W-2 heads and im running hedman hustler fenderwell headers .One of the gaskets blew the other day ,so i went down and got a set of Mr.Gasket #5939's for W-2 heads and they dont fit my headers pattern.My heads have two sets of patterns for the exhausts .Which gasket set do i need and were do i get them ?The ones that came off of it were Hedman brand ,but didnt have a part # i could see on them . Thanks in advance ...