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I don't know the exact belt size but you should be able to measure and get close enough to count. If I am recalling correctly, smog pump is below the alternator but above the crank pulley. So, measure fron the center of the crank pulley to the center of the smog pump pulley. Then from center of the smog pump pulley to the center of the alternator pulley. Add the two measurements together. Then measure from center of the crank pulley to center of the alternator pulley and subtract that measurement from the total of the two previous measurements.
crank + smog + alt = "X"
crank + alt = "Y"
X - Y = difference in belt length
Note: This is an approximate measurement only. This formula does not take pulley circumference into consideration.
There is a much more complicated method that is more accurate but would take forever to post. Email me if you would like to discuss it.
Hey, forget all that math, it hurts my head!! All you need to do is go down to yuor local parts store and buy a few belts that are different sizes. Which ever ones don't fit, just package them back up and return them!! Just make sure all you belts are smaller than the original one!!! HOPE THIS HELPS!!!