Some guidance here would be helpful and appreciated:

On the rear of W126 cars, which adjustment controls the toe-in and toe-out (not camber)? And where exactly is it located?

On my vehicle, I believe that the wheels are somewhat toed-in, which could affect ride and handling. I do NOT have sag, or any camber problems. But I am curious about the toe adjustment.

Can anyone advise in detail? Thanks.

I know that this is not going to be the answer you are looking for but I would never think about messing with the adjustments on my suspension without access to a computer alignment rack. This is not one of those things that you can say it is pulling to the right, so I will crank this bolt. This is one thing that I only rely on professionals. I make an appointment and make sure someone who knows what they are doing is going to be working on the car. $65 or so for a 4 wheel alignment is money well spent. Will pay for one tire and if they are out of alignment is out they will not last long at all. As for specs that you should use I would not stray to far from factory recommendation. Check with local car clubs for recommendations on alignment shops. Not something you want to be done at the local Pep Boys. Small shops are usually better in my humble opinion.

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Currently
1991 Mazda Miata 174000
1991 Subaru 189,000 Winter beater

got rid of:
1984 VW Vanagon 195,000
1976 350SE Euro 185,000 KM
1973 280SE 4.5 (boy do I regret that)
1980 280SE European W126 4 speed manual (miss it)
1989 BMW 735iL 119000 (good riddance)

You can only do front alignments on 126 as the rear cannot be adjusted.

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... Kerry

126 tailed by a 203, 129 leading the pack.