Where can I get a NEW fuel filler neck?

[PRattenbury]

I am bent on solving my 'won't take gas' problem. I have a new gas tank on order, with a new sending unit and new straps to mount it with. All I lack now is the filler neck to replace, which may be the most important part of the whole mission. Does anyone know where I can get an OE replacement filler neck? I have an 80 shortbed fleetside, 16 gallon tank. Any points in the right direction would certainly be appreciated! Thanks!