Fastlane sells that plastic jaw seperately...that is commonly what fails on these cars.

I lost both of my rears...back then your couldn't get the part seperately, so I had to spring for two new regulators!

__________________
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