Complete fuel system question

When I got my 70 Challenger R/T last year, the fuel tank was missing and the filler tube was the only part of the fuel system and it was in the back seat. I’m pretty sure I’ve got the parts I need, but I’m not sure exactly what sequence to assemble everything. I know that the filler tube can be tough to get into the rubber on the tank. Can anyone tell me how the flip out gas cap and the filler tube mount together? Are there gaskets or rings between them?
Also, should there be a gasket...

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Author: stevepoppop