Alternative to cast iron WP pulley for AC?

[cortcomp]

The front of my factory cast iron 3 groove water pump pulley on my 66 is broke (the nose piece that centers the fan hub). I could probably make a snug down to fit in there and center the pulley, but i'd rather replace it, i'd feel better with the fan spinning that fast, knowing it was all one piece.

Anyways, i see they're rare and if someone has one for sale i haven't seen it yet. I have power steering and AC, is there another three groove pulley from another year i could substitute for now?

I apologize if this was already asked, i didn't see anything searching around. Thanks!