Also here is all the b-body parts they sell ...If you scroll down 1/3 of the way down they have rocker panel covers no picture though.
I called them before ordering panels for my 1963 Dart,they are really helpful and I am happy with what I received....
Here the B body page: http://www.autobodyspecialt.com/cgi-bin/commerce.cgi?search=action&category=0010