My 1966 230 SL has two v-belts that drive the alternator and the water pump. i.e. the respective pulleys are twin V. The issue is that the alternator has extremely little pivot room for adjustment. Maybe 1 inch - maybe. It is constrained by the metal shroud around the air filter and the rod on the bracket with the nut that is used to actually do the adjustment. I've had a heck of a time trying to find the right sized belt since it is so constrained. It currently has the AVX10x1125, and those were a beast to re-install.
Can someone share their experience, and what belts you are using? Also, is there anyway around this extremely small zone for adjustment?
Thanks,
Harry