I'm not certain if the 126 has one as I have not looked it up but this will cause vobration ahile driving too if the wheels start to wiggle.

I just did the rear mounts for the brake support links/track rods and they were pretty straightforward and not too tough. 3 hours for both. It made a world of difference in my 81. I still need to do the 84 as it just rattles every now and then when you go over a bump or pull in a driveway.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique