Where to buy parts for my transmission?

[TwoFiftyShifter]

Hey everybody! I have a cracked adapter between the tranny and transfer case on my '87, and it needs to be fixed. I got another adapter from a guy for $50, but now I need the gaskets on both ends. Anyone have any good places to order those particular gaskets online? I found a place that has the transmission side gasket, but its for a Jeep so I'm not sure it will work.... Anybody know any good places?

Here's the place I found:

http://www.novak-adapt.com/catalog/sm465_parts.htm

Thanks for any and all input