Stop in for a cup of coffee

Mattax said
In my spreadsheet I have both a standard and a P-part number that are fairly recent

Right Angle Adapter Gasket Package Engine 4897 939 Mopar Perf P5249320

edit nope>From the 1989 MP catalog an older number P3690884 <edit: nope. That's the full package including the aluminum adapter and bolt.

Maybe you can cross reference them.

Detroit Muscle has them listed as does Summit (and probably Jegs) Roseville Moparts, If you find the Fel Pro set, this is what you see.