PLastic petrol tank and filler neck

hi guys where i can i buy a plastic PETROL TANK AND FILLER NECK??? ALSO ALL THE PIPING FOR THE FUELLING AND THE NEW FUEL PUMP?

CHEAPEST PLACE PLEASE!!! thanx guys!

Not sure if those parts are available in plastic.  I do most of the fuel line parts at www.golfmk1.co.uk

Never heard of a plastic fuel tank n filler neck for a mk1. unless its in the boot on a race spec car maybe,mk2's had them you could ask on here if anyone has converted one to fit a mk1. good luck!