need to find tensioner pulley thats below

[GLENN"S854x4wagon]

my ac

85 subara gl station wagon 4x4

i have 104,000 miles on it but today my tensioner pulley went on 105 east just pasts the 110 to la

dealer told me that the ac was a after market add on so they cant get that pulley so you should check yours before it goes out but if it does and your alt belt is still good you can pull the back one and reinstall the other one and your on the road