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