I bought this as a replacement as an existing identical unit in my Mk4 golf had packed up, to my surprise I discovered that the existing unit was itself a replacement, someone having cut through the washer pipe and rejoined it when replacing (not a good idea). This one bolted straight in and works fine but it's surprising that the car has now needed three albeit the mileage is 235000, as the unit isn't used a lot and only works on intermittent wipe. The problem seems to be that the internal metal part controlling the movement rusts/seizes over time. The biggest issue was reconnecting the washer pipe as despite a number of attempts I couldn't achieve a watertight fit and eventually purchased some genuine pipe joiners from the local vw dealership, these proved expensive to buy. If you are removing an existing wiper unit don't cut through the washer pipe, instead gently prise the end fitting from the washer motor.