viewtopic.php?f=4&t=20795&p=168777&hili ... RS#p168777
that's actually titled Front Suspension, there doesn't seem to be much, so FWIIW here's a sketch showing - I think - what's going on at the back, and what scope there is for tweaking a car that's mis-aligned.
You can't do anything about the individual toes at the back (some dispute this, see the above string) but you can balance the overall alignment if need be.
And perhaps above all, you can get the back end surprisingly wrong if the shims are not in the right place.
On my car the difference between the widths inside the rubber-mounting claws and the frame rails of the car is roughly in the range of 4.3 to 5.6mm.
That's approximately three C17228 shims, which seem to be in the 1.45 to 1.60 range, which would make 12 in all rather than the 8-off listed in the parts diagrams, tho' given what a bitch they can be to get in maybe 8 is more realistic
So if I were to crab the IRS by shimming a max - say - towards the RHS on the front mountings, and a max towards the LHS at the rear mountings, you're looking at a potential 9mm or so of mis-alignment, which - over the relatively short 250mm that separates the two mountings - equates to a full 2° of crabbing.
And if you only distort it by one shim just on both - say - front mounts, then you're looking at one sixth of that, or 20' of arc.
The manual states "note carefully the number and location of the packing shims" which suggests to me that the factory did indeed sometimes have to tweak the alignment upon assembly, and that you can't just assume symmetry, even tho' that's obviously where you would start.
