I bought have a used DC sports d-series header im trying to install on my 94 coupe. It's the 4-2-1 two-piece. What gasket (part #) do i need for the connection between the header and down pipe? I've been to auto zone (they had only one that looked like it would work) and advanced auto (they sold me two of the wrong gaskets, which i now have to return). Does any one know the part number for these gaskets? Thanks in advance for any help.