Fuel Filler Neck for Tank Relocation

[TypeSL2]

I am about to do the tank relocation from the cab to under the bed in our '64 long stepper. We are not going to cut into our floor for the filler. We got the side fill tank from LMC. I was curious what you guys have used to put the filler behind the reverse light on the driver's rear fender. We really want to put it there, but didn't know if there was a general knowledge of which part is used. I did a bunch of searching and came up with nothing. I was thinking of using a filler tube out of a newer model chevy truck since it should have the bends we need to get it where we want it. Any help is appreciated. Thanks.

James