[tommys72]

Originally Posted by Eddie H.

You could slice off the original filler neck from the old tank ( Take it out, fill to the top with water, and very carefully cut it off with a hack saw, so there's no chance of it going boom), then leave it sticking out of the rubber grommet with a cap on it. It would look stock. I would plug it up with something, however, to prevent somebody from accidentally filling the cab up with gas.

For a stock look this sounds good to me. Cut the neck off and weld a piece to the end so its just the neck sticking out of the cab, put your cap on it and go.