try vw for them, should be able to supply new copper washers etc. the one between the fuel metering head and air metering flap isnt special, so if you have a pack of generic orings these will do if can find one the right size.
the rest on there are copper washers, again if you can find em elsewhere the right size you should be ok.
vw do a repair kit for the pressure regulating valve as well, if required