My nozzle tip is broken off. It is apparently only available as part of the whole motor assembly for the rear washer. I just need the nozzle only.
Which part on this diagram are you asking about? RealOEM.com  BMW R53 Cooper S SINGLE PARTS FOR REAR WINDOW WIPER
I've added an arrow to the image below pointing to the spindle that the wiper arm bolts to. At the other end of the spindle there is a valve and the washer fluid tube. The spindle is hollow with the washer fluid sprayer at the end of the spindle.The entire motor assembly is molded into the plastic housing. Individual parts are not available as a regular part number. I'm sure a very talented DIYer could fix it. The rest of us look for a used wiper motoring assembly.
I have the whole motor assembly for sale with a arm and blade. came off my car when I bought it brand new