Unfortunately there doesn't seem to be as many sheet metal peddlers on the net, like there is mechanical. I got a rear panel, left rear quarter, and deck lid from Adsit a couple years ago for a friends 114 I was repairing. The panels all fit good and are holding up well as far as I know (he moved to NY). So you can start your search with them, Here is a link
http://www.adsitco.com/catalog/default.asp?CID=185