Head pipe to manifold flanges

Anybody have the part numbers, or links to the headpipe to manifold flanges for the following manifolds.

1964-1966 a body driver side manifold

1967/1968 pass side manifold

Driver side is flat flange, passenger side has a "bell" on it that resembles the old donut style, except it's part of the manifold.

2nd question.

We want to run 2 1/2" exhaust odd the manifolds all the way back, but I'm not sure you can bell out a 2 1/2" pipe to seal against the bell style 1 7/8" manifold.

Suggestions appreciated. Eric L