Nope i would bother asking VW to be honest , although every MK4 in the USA has a recall for that very reason i believe !
Ive just returned from the USA and while i was there i costed the part $ 75 (£44ish)
However .... i had my passenger side go recently !
bought the kit off Ebay for £33ish then had RAC windscreens fit it for me 1hr labour @ £30 ...
total £ 63 !
takes some beating id say
regards