Just found a couple of sites that may be useful.

http://www.cougarpartscatalog.com/
I just bought a few items online, they list a lot of Cougar and Mustang interchangeable parts. Great service and very helpful. I found items like repo window guide inserts which seem to be very hard to find. Recommend them.

Also http://1970mgr.org/index.html the Grabber Registry has a lot of useful info under tips and maintenance. (hope that's ok Ray )
They don't have a cool forum like ours but some useful info and a link to this site.