Try Powerhouse Performance Parts @ 519-524-2211. They are in Goderich, Ontario, Canada. I bought the quarters for my 69 from them and was very pleased. Even with the UPS charges from Canada into US they were cheaper than most I have found locally - and much better quality. The guys at the body shop couldn't believe it when I walked in with them.
They have a website, http://www.powerhouseperformanceparts.com/info.htm, but I couldn't connect just now - server is down. Owner's names are Rick & Jodi Berwick. Very nice folks. As Rick says, "If I don't have it I can get it".