Unless somebody knows different, my fairly recent aftermarket search turned up zilch. Ultimately I got lucky finding both in usable condition at an out of town junkyard. After finding my parts, I strongly suspected the rear window switch bezel was identical to the pickup dual tank switch, but I didn't have one to directly compare. The tank hardware does appear to be available aftermarket.
Alternatively eBay would probably be a source, but I haven't searched recently.