When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Try Tractor Supply or other "farm-oriented" store.
Good post up jeff, another option is of the older rigs. My '55 fairlane is 6 volt as well, so checking out older rod sites may help find a 6 volt source.