NP205 oil seals are hard to locate???

[OlyHeeebz]

One of the 2 rubber seals that goes inside the adapter between the TH350 tranny and NP205 in my truck has gone bad, and oil and trans fluid are sloshing back and forth.

To my surprise, the local GM dealer in my area can not seem to locate the seals. In fact, they can't even cross reference them to find out which ones to order. There are little numbers on the seals and everything, and the guys behind the counter still can't figure it out.

Anybody know where to buy these seals? Or what the new GM parts number is?

Thanks