It appears that your car is equipped with multiple v-belts, rather than a serpentine belt so there most likely aren't tensioner pullies. Here is some general info that may help.
To adjust the tension of the alternator drive belt on older models, loosen the pivot and mounting bolts on the alternator. Using a wooden hammer handle, or a broomstick as a prying device, move the alternator one way or the other until the proper tension is achieved. Do not use a screwdriver or any other metal device such as a pry bar, as a lever. Newer models use a tension adjusting bolt. Loosen the pivot bolt and the locking bolt, then turn the tension adjusting bolt until proper tension is achieved. Tighten the bolts securely, run the engine about minute, stop the engine then recheck the belt tension.
Air Conditioning Compressor
A/C compressor (always use caution when working near the A/C compressor to avoid damaging the refrigerant lines) belt tension can be adjusted by turning the tension adjusting bolt which is located on the compressor tensioner bracket. Turn the bolt clockwise to tighten the belt and counterclockwise to loosen it.
To adjust the tension of the air pump drive belt, loosen the adjusting lever bolt and the pivot bolt. Move the pump in or out until the desired tension is reached.
NOTE: The tension should be checked between the air pump and the crankshaft pulley on cars without air conditioning. On cars with A/C the tension should be checked between the compressor and the crankshaft pulley.
Power Steering Pump
Tension on the power steering belt is adjusted by means of an idler pulley (some models may use just a lower adjusting bracket setup, similar to the alternator adjustment service procedure). Loosen the lock bolt and turn the adjusting bolt on the idler pulley until the desired tension is felt, then tighten the lock bolt.