I don't think they'll fit. Just by looking at the seats, the 300 seats are wider. I think they're taller too -- which would be a major headroom problem. I also have a 190E, but mine has manual seats (Which by the way, can't suck enough! I LOVE the car, but HATE the seat controls. They cannot be adjusted properly for my 6' 2" frame.) I've been searching for power seats to swap in, but they're kind of hard to come by. If I were you, I'd plan on swapping just the motor. I'd bet my house that all the seat motors are exactly the same for 190, 300, 400, 500/E & C class cars.

Good luck, and post back with what you discover.

Jeff Pierce

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Jeff Pierce

Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
Gravely 8120
Previous Vehicles:
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F