Flush mount fuel fill/cap??

[Bigred350]

I'm looking for a flush mount fuel cap/fill to mount on the side of a flatbed truck. Kinda like the one pictured but would like one that didn't have to use a special key to open it. Anyone know where to find one that won't break the bank.

 

[DirtMonkey]

Here's a couple places that have this sort of thing,
http://www.tanksinc.com/index.cfm/page/ptype=results/category_id=62/mode=cat/cat62.htm

http://www.fillernecksupply.com/