I am trying to get the round cone gasket for the exhaust manifold flange at the bottom ...the books say walker 31362 so I bought it ...the inside dia is only 2 1/16 the diameter on the pipe where it installs is 2 1/4. I have the exhaust manifold that has the "accordion bellows" on nbr 1 and 6 pipe. . I thought the stock manifolds were all 2 1/4 ...the manifold came with the donor motor so I don't know what make it is and I can find no "specs" on any of the gaskets listed in most catalogs...thanks

 

Mine always restrict the ports/manifold a little. I just use a top FelPro gasket and trim the holes to fit with a razor knife.
In fact, I’m trimming one right now to fit my new Banks header. :-)

Just reread your post. Your talking about the flange gasket where it meets the J pipe. Same applies, trim the inside to fit the diameter of the smallest pipe.