Don't see how that casting numbers help or maybe by chance?
I have 2 left manifolds
ne is useless as badly broken at the end. The other one I am using but it's cracked...will get it welded this winter.
The numbers are: 2658381 and 22881901. No similarity and even the quantity of numbers is different.
So both numbers would work but that is not the way people in North America work. They would want info such as: 1963 Valiant as in a specific car, and Sandy mentioned Plymouth but there are several versions of Plymouths as in Fury, Belvedere, Valiant and Barracuda...maybe others. Knowing which one is the information I need or for that matter many of us do.
Anne