I replaced all the fan belts on my 1008 yesterday. I went with belts that were 1/2 inch smaller than the ones listed in the CUCV Wiki. The last time I replaced them, I used the numbers provided and they were all at the very end of the adjustment range from the git go. When they got broke in good, they squealed at times, especially the right side alternator. With the slightly smaller belts, they are right in the middle of the adjustment range which is perfect for later readjustment.
I used Dayco belt part numbers:
Drivers side alternator 15775
Passenger side alternator 15485
Power steering 15450
I was surprised how expensive the belts are, I can buy original equipment (Not Dayco) fan belts for Mercedes for less than half the price. Oh well.