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To add additional confusion, there are two diameters of A/C pulleys as well which should have a few millimeters difference. The newer or replacement compressors have bigger pulleys so if your belt causes the tensioner to be too tight you want the longer of the two choices.
Anyway, Using your picture with the new longer belts, assuming the belt leaves the crank pulley going from left to right at the bottom...
It go about 1/4 the way around the A/C pylley ant then directly up to the alternator.
It wraps almost 1/2 way around the alternator and then goes back down to the idler pulley.
It wraps a little more that 1/2 way around the idler and then goes up to the power steering pump.
From there the route is as before.
Hope this helps. (Also, if I've been inaccurate please correct me.)
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'96 965 with 16' wheels at 101K. Had '85 745 Turbo Diesel for 200K.
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