I see 2.363 in my third attachment - the 1929-1957 Parts Catalog Page:
2.363
BUSHING GASKET CLAMP, Distributor Mounting for 1955 and later
8 cylinder engines?
2.363 is not even shown in earlier Master Parts Catalog/Books (no 8 cylinder engines)?As usual, Carl, I think I am in my own
twilight zone on this topic.

I find it helps when I talk/mumble to myself a lot.
Also, I think this thread at-first was referring to the "make-up" of the "cup" that has the screw-on metal "cap".
I am referring to the spring and the tip that push against the distributor shaft. In particular, the makeup/composition of the "tip".