Just an FYI, a Polaris Predator gas cap fits our tanks perfect, I've got a Tusk cap on my Pred, and just a trial, fit PERFECT!!! I'm ordering a polished cap for the Dale.
I also bought a Tusk gas cap for a predator 500 and put on a dale gas tank. Works great. at first it seems loose but tightens down just like the stock ones. To bad black and red are the only colors i found thru Rocky mtn atv for the pred.500.