I believe it's a model year thing, not a model thing.

After 1987, there was a different shape (larger) to the shifter opening for the 126.

The rubber is not available separately, according to three different dealers' parts depts, when I checked ~3yrs. ago.

Try this? http://eris-car.de/cgi-bin/shop2/iboshop.cgi?show2400,2812806110

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)