I was wondering if there was a parts catalog for Plymouth, Dodge and Chrysler, similar to Macs for Ford parts.

 

Try this http://www.yearone.com/

 

You can find a few things here and there for C body's. But no, there isn't any big catalogs that are c body specific. They can be harder to find parts for than the more popular A/B/E bodies. Your best bet if you are looking for C Body part is to start looking on some of the classified here and on some of the other C body specific sites. parts do come up sooner or later I have found, it just takes a bit more to find them. But it can be exciting when you find the part you have been looking for. You also might try some of the Demolition Derby sites. A lot of those guys use C bodies, and will sell alot of stuff that they don't need and are stripping off of the car. Also try this guy, he has a c body junkyard and I hear the prices are reasonable and the service is good. http://www.cbodies.com/

Here are some c body specific forums that you might find helpful as well.

http://www.cbodydrydock.com
http://www.forcbodiesonly.com

Hope it is ok to list here, if not feel free to delete and my apologies.