The diagram of serpentine belt for 98 Buick Riviera should be on a decal on the fan shroud.
Here is a link to notes on the Removal and Re-installation for the supercharged model.
http://rivfaq.bravehost.com/Pulleys.htm
Here is another useful link that may help with the process.
Hope this helps helps. Please keep us updated and remember to rate this answer.
TF
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