My 1990 560sel is pulling to the right. A front-end alignment didn't solve the problem. The inside of the right front tire is showing bad wear. All four tires match and have 60% tread remaining. It's not that noticeable until I get it up to 60+ mph then a noticeable vibration begins. If it's not an alignment problem, what else should I be looking for? (and how much will THAT cost?!) Thanks.

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2002 ML320 (thereby making my 560SEL my "spare).
1992 500E, pearl black, 27,000 original miles as of 7/2003.
1990 560 SEL, black pearl metallic, sweetness to drive. Fully outfitted with driving countermeasures (Beltronics radar/laser detector and Uniden BCT-12 Bear Tracker scanner).
1985 Porsche 911 meteor metalic gray, a rocket to drive.
1988 Chevy Silverado pick-up (gotta have something to drive to the rodeo!)
1978 Corvette Indy pace car for show
1971 Opel GT for sentimental reasons