1991 gti cabby fuel filter needed where

Need a new fuel filter for my 1991 gti. I had bought one recently from gsf but doesn't matter what I try cant get it to stop leaking iv fitted new copper gaskets so thinking it the wrong one as they aint to clever at giving you the correct parts at the best of times. Can any one point me in the direction of the correct filter with the gaskets please?

Later filter fitted to my car (1988) big filter and yours should have the same.
MANN Part number WK834/1

I use copper washers and replace all four some times the new filter comes with 1 which I use, one side is the same size as a sump plug washer and the other side are smaller. I use a pair of plumbers pliers to grip the filter and a ring spanner on the bolt doing up the connection making sure it's tight as there is alot of pressure in the fuel system.

http://www.ebay.co.uk/itm/250mm-10-PLUMBERS-WATERPUMP-WRENCH-PIPE-GRIP-PLIERS-WATER-PUMP-SLIM-JAW-UK-/111494383167?pt=UK_Hand_Tools_Equipment&hash=item19f595463f

Thanks for that just ordered one it comes with one gasket. what size gaskets do I need for the other 3

The bigger size are the same size as a sump plug washer so I order a few so got some when changing the oil. You need 2 for the fuel filter

http://www.eurocarparts.com/ecp/c/Volkswagen_Golf+Cabriolet_1.8_1988/p/car-parts/engine-parts/engine-parts1/sump-pans-and-sump-plug/?360440010&1&edd594f76125444b5c44fcc9d7e50d82b006f54f&000567

The other smaller ones the same size as with the fuel filter I can remember the size but last time I took the one I had with the filter to a local motor factors and they had a box with washers in and they just gave me a few for free which was a result!