I replaced my worn out driver's seat with a newer passenger's seat, rails and all. I suppose if you wanted to get really fancy, you could swap the rails, and even swap the adjusting knob to the opposite side, but neither are absolutely necessary to get the seat to bolt down on the driver's side.

Nate

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1985 300DT, Classic White, California, 159K
1982 240D, Metallic Silver-Blue, Manual Everything, 376K
1981 240D, Orient Red, Parts Car/Engine Donor, 145K

"When nine hundred years old you reach, look as good you will not. Hmm?" - Yoda