Just stumbled on this thread last night. Just wanted to say you are doing a beautiful job on your Swinger. I was also wondering whether you restored the filler tube or if you located a NOS unit.
The filler tube is the original one that came with the car. Sent it out and had it zinc coated like most of the fasteners and other misc. parts. (I think the original tubes had some sort of lead coating on them, although that may be incorrect?!?) Thanks for the compliments! Ben.