W123 rear tire uneven wear

Nothing to align on a 123. An alignment check will show one of the control arms bent (usually by a siseways impact, as from sliding into a curb, or by the control arm being weakened by rust).

Bill Ditmire Ditmire Motorworks,Inc.

The rear shocks have nothing to do with the rear alignment. Your car has worn bushings back there that allow a wheel to shift back and forth making the rear no longer square to the road, thus the odd rear tire wear.

Technically, there is a bit of rear toe-in that's created by the car's ride height and the geometry of the rear suspension. There's NO rear toe-in adjustment, only a height adjustment via spring pads.

So have the rear control arm bushings checked.