Alternator Brushes. Sold in pairs. BMW #12311244480
Much improved brushes for your BMW Airhead since these have lugs for screwing onto the terminals instead of having to solder them in…..which is difficult.
A nice easy upgrade to ensure your generator stays reliable.
Have a look at how your charging system works: http://bmwmotorcycletech.info/trbleshootALT.htm