First time Ive worked on my Moms 99 Lasabre..and I see that the left side plugs are hard to get a plug tool on and still get the torque needed to break it loose!
Any support from you long time lesabre owners?

 

You probably found a way by now, many cars have fastened rubber flaps or covers on the inner fender well. Used for a socket and extension to change plugs in tight areas. Remove tire of coarse and rubber flap for leverage advantage. My '87 Corvette had this scenario on the passenger side and the entire front end lifted off on that. Think the plugs on my Boss are good for 100K miles; hate that as of coarse the plugs are way gone already by now (2,700 OD) LoL.