I have a 95 Cabriolet and a 92 Coupe W124. It looks to me that the front seats are identical. You might look into this. While the coupes were not a high production model, they produced alot more of them. With a lower value than a Cab, you might have better luck finding one in a wrecking yard. Best of luck.

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1994 E320 Cabriolet
1992 300CE (Sold)
1991 300SE (Sold)
1986 560SEL (Sold)