Looking for a crankshaft two groove pulley
I think that this is the one that you need brand new from Mancini Racing.
If you were looking for one cheaper, try Ken (physixx). I have dealt with him and he is a good guy to deal with and is reasonable on price, if his is the right one.
This one has different diameters for each belt. It is listed as for non-A/C with P/S:
http://chucker54.stores.yahoo.net/maabcrwipost.html