Decided to do the serpentine belt on 98 Bonneville, Not sure if anyone has done it this way but after looking it over I discovered I was able to remove the r. front lower motor mount bolt though the wheel well.

Just turned the wheels far to the right, removed the plastic cover and used two long extensions on a breaker bar. Saved me from having to try to jack up the front end to crawl under or pull the wheel. Turned out easier than I thought, changed belt and idler in about 1 hr. Maybe not fast for some but worked out for this old guy.

I did a write up on that. Although I did it with wheel removed, but it will work your way as well. I really don't understand who thought it was a good idea to run a belt threw a engine mount.