Sorry for taking so long. I'm up to about three jobs nowadays and do this for "fun"
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The power steering pulley has to come off. Take your old serpentine belt and wrap it around the ps pulley. Pinch it close to the pulley in a good pair of vice grips. Hold the vise grips against the pulley while loosening the fasteners. Once you get it out of the way you will see that troublesome third fastener.
Your initial description did not say which 95 w124. I initially only think about the diesel version when reading these threads.