After a few attempts, the alignment is now sorted out on the 560SEL. The alignment shop wanted the castor bushings changed, which were a bit worn but really not all that bad. Had those changed and after I think two more goes its now fine.
I also used the 50% pirelli sales I posted previously to get new tyres for the Gullideckel wheels I had just taken off the 450SLC. They had OK tyres on them, Goodride RP28 I think they were called. Anyway, despite the name I really didn't like the way these tyres rode on the car, so I had them changed for the pirellis and its really made a big difference to the look and feel of the car.
The 2016 Michelins on the old wheels now become spares for the 560SEL, SEC and 450SLC. The spares on all these cars were well over 10 years old and while ok to get back home on a short trip, I sometimes do longer trips in these cars and I want the spares to be good. This is particularly the case next year in the 450SLC as I plan to drive it to the National Rally in Adelaide.