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The 1996 Buick Riviera SC has two belts. An inner and an outer belt. The outer belt is for the supercharger and the inner belt is the drive accessory belt. Rotate the tensioner pulley (idler) and remove the outer belt first. The do the same to remove the inner belt. Check all make pulleys and make sure they are free of any debris or oil.
Install
Route the belt according to the diagram above leaving the tensioner pulley for last and maintaining tension on the belt with your hand. Rotate the tensioner pulley enough to slip the belt on. Inspect your belt and make sure it on correctly before you start to put the outer belt on. Repeat these steps for the outer belt.