Scirocco Register

Hey, looking for a fuel tank for my MKII GTII 1.8l Carb. I think the tank I'm after is this one... (http://www.classic-vw.co.uk/mk1-golf-ca ... 5002-p.asp) although I'm seeing contradictory information on that website and VW Heritage. Anyone got any clues?

Thanks.

Or this one. Even cheaper! (http://www.ebay.co.uk/itm/PETROL-FUEL-R ... SwAANY5ca-)

Gah! Finding the right part might actually kill me.