I have the small rod to release the seat.
The chrome cover on the outside of each
seat is blank but the inside has a slot.
That slot is covered with a small patch of
material. Underneath the chrome cover,
a metal bracket has a long slot that looks
like it might be the base of an adjuster.
I am going to compare my mechanism to
other W113's to see how much difference
I have. I feel that my seats can be
matched with the correct knob which will
give total adjustment control.

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VR
1967 250SL