i think i found one just yesterday! new unused and still in vwheritage packet. i will try and remember to look tonight http://www.vwheritage.com/vw_spares_Fuel-breather-T-piece-68-79_act_shop.product_pID_80669_lang_EN_country_GB.htm?crumbStartPage=1 Part ID: 211-201-405 £5 posted?
would these do the job http://www.ebay.co.uk/itm/Plastic-Barbed-Connector-Pipe-Hose-Joiner-Tubing-Fittings-Air-Fuel-Water-Petrol-/270868196787?pt=UK_Home_Garden_Hearing_Cooling_Air&var=&hash=item3f1100adb3