seat covers
For decoding a fender tag, try this:
http://www.stockmopar.com/how-to-decode-a-1969-1974-fender-tag.html
If you want to go for an original looking replacement, I recommend Legendary Auto Interior. Great product & service.
If you don't want to go original or save a few bucks, try Seatcovers Unlimited. I like their stuff, but I've had some fit issues that didn't happen with Legendary.
The checked seat cover is a Legendary for my 72 Demon. The front seat is tweed from Seatcovers Unlimited in my 73 Dart.