Well you can go with GM original plugs and wires. I read somewhere here that Buicks should have original AC plugs, or they run like crap. but have since learned that is not true in my case. There was no way in the world I could get at the back plugs, so I took my 2000 LeSabre to a small garage I use up the road. He put in NGK Platinum plugs and NGK wires. There have been no problems, and while it is now my wife's car, on those occasions when I drive it, it seems to have more power than it ever did. Might just be me but the NGKs are great.