Believe one of the assembly manuals has the routing but can't be sure and not sure what time period it shows
Here is some pictures (sorry for the poor lighting and angle - wasn't taking them of the belt arrangement )
Note that this example is from an early car - Dearborn S code Thermactor with PS and wo/AC
Do have 7R02S141857 which has the same arrangement but the pictures are from a worst angle
Green arrow - Shows the PS belt from another angle
Blue arrow - Shows the PS belt passing under the water pump pulley
Pink arrow- Shows the Thermactor pump pulley (now missing) belt hanging down and the upper water pump outer pulley with no belt
First picture shows the double alternator pulley and belts (using the inner belt track )
Same arrangement on 7R01S108xxx
Hope this helps