Fuel tank gasket help

I'm in the process of getting a 72 Scamp up and running after sitting for eight years in a backyard and I'm in need of a little help. Same old story as usual, bought my first muscle car and things start going wrong faster than I can fix them. Oh well, haha that's what I get for buying a project car.

There's rust in my gas tank so I'm cleaning it out and resealing it. Here's my problem; I can't find anyone who has new gaskets for the thing. I need the gasket/collar thing the filler neck goes through in the trunk, the gasket that goes on the tank where the filler neck goes in and a gasket for the fuel sending unit. I've been looking everywhere and I can't find any of it. Any help anyone can give would be very appreciated. Thanks.