seriously, the best catalog is the internet. there are dozens, maybe even hundreds of sites that have various parts. have you checked the links section of this site?
i am not aware of anyone who handles all of the parts, much less prints a catalog of them. most of them specialize in one area of restoration - motor parts, interior, body, etc. if you find someone who does, LET ME KNOW!
If you are looking for restoration products like paints and tools, try The Eastwood company. If you're looking for restoration parts for your Cougar, check out my two online lists at www.cascadeclassics.com