Hidden Fuel Filler Neck

[truckintexas]

This is a longshot, I guess. About 12-18 months ago I was searching Ebay and saw a pretty cool truck for sale. I can't remember the year model or the color, but the coolest thing had been fabricated. The driver's side tail light would open up and the gas filler cap/neck was hidden behind it. I think it hinged at the bottom.

I have seen the side marker light method, but I think the tail light method would provide more room and a better angle for the filler neck.

Does anyone have any information on this type of fuel filler install???

Thanks in advance!!!!