Here are 2 sources for you:
http://www.simpsonltd.com/index.php?cPath=160_184_222

Simpson is family operation, very good people. As you can see, they have a large on-line selection. You could call them with your needs.

Also, do not forget Ken B. at Kebco. He off stops by here. I have dealt with Ken. Honest as they come. Give him a call. http://www.kebcollc.com/dept.asp?did=1

You can check the serial number for year of production:
http://www.weiss-trading.com/SerialNr/YoM.html

Pete