Problem fixed.

Part was $6.98 (good price) + $3.00 shipped via FedEx (even better), took about 30 minutes including reinstalling the armrest.

Thanks jim 4X4 for pointing me to Tom @ Caliber, thanks MBenz for the pics!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car