I've got a spare set of seats for my 94 cab, from a late coupe. Bad leather, but wanted spare frames. Also have a nice seat from a 94 sedan in matching leather.

I recall my W114 coupe had a lower cushion that was shaped differently than the sedans. Specifically, the side skirts were shorter on the coupe seat. That is, the distance between the top horizontal part of the lower cover was closer to the frame on the coupe seats.

Last time I compared the W124 seats, it appeared that the two door seats also had a lower cushion. The center section that you sit on looked similar, possible to cut out that and resew into coupe seat.

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