I did and they found it. The part# on my slip is 2464324AC. Now I'm not sure if that number will be the same at another dealer or not. The gasket I got is way better than the cork or the rubber one I have in there now. I gots to get my lazy butt under there and change it, LOL.
Here is a pic of the one I picked up:
http://www.cascadetransmissionparts.com/48repangasketbonded.aspx