This washer bottle was fitted to the Mk2 and all Mk3s.  On the Mk2 its bracket hung on the battery box.  On the Mk3s it was fitted on the fender up against the radiator which might have been a bit better placement. This is pretty much an exact replica of the original.  Please pay attention to the polarity 'cause the bottle may say one thing but you may have to do the opposite. Genius!