I misunderstood. I thought you wanted to fit the reclining bench to your car.

Only the 560s have reclining as standard. It was optional on other LWB models, not available in the US on SWB models.

You should be able to transfer the leather from a later bench to your frame. Keep looking for a set of matching headrests.

As Jim says fitting electric seats to a different year 126 is not a plug and play affair at the assembly level. It might be possible to fit the 84 seat controller to the 91 seat frame. It's a simple matter to release the headrest drive cable so you can manually adjust the headrest.

Sixto
93 300SD