Credo che il capoofficina di una concessionaria sarà disposto a risponderti.
In ogni caso una ricerca in rete, tipo questa, magari ti aiuta:
https://www.google.it/search?q=albero+motore+bmw+r1200gs&safe=active&client=safari&rls=en&tbm=isch&imgil=icC6yiFRzU_eFM%253A%253B5WwnQJN3u1DrCM%253Bhttps%25253A%25252F%25252Fwww.boonstraparts.com%25252Fit%25252Frecambio%25252Fbmw-r-1200-gs-2008-2009-(r1200gs-08)-albero-motore-2008%25252526ID%2525253DB10000EP1Z&source=iu&pf=m&fir=icC6yiFRzU_eFM%253A%252C5WwnQJN3u1DrCM%252C_&usg=__XG69DTf26t8RLvHy3m-_RuH6H3Q%3D&biw=1160&bih=716&ved=0ahUKEwi5iZSgnKbUAhUGOsAKHV_KAWUQyjcIRw&ei=aw01WfmnHIb0gAbflIeoBg#imgrc=icC6yiFRzU_eFM:
R.