Get a seat base from an older car.

I think the wiring changed with the 94 model.
There is also a potential difference between memory seats and non memory seats since the memory module is under the seat.

I've got an 87 300D parts car close to you in Tidewater, VA. It's got the correct 87 seats still in it.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles