Roadster tank, seat, rear fender, EDIT: air filter assembly and grabrail

Looking for a Roadster steel tank (black, preferably with pin stripes)

and seat. Also need a rear fender assembly (the fender and brake light, plate bracket etc.)
EDIT: I am also looking for an air filter assembly (the metal kind, with the back plate) and a Roadster grabrail
I have found these, only looking for the tank now

EDIT: These are all for a '74 MK2