That 231 kit is a weak point of those front ends just replace that first.
Upper outer pivot repair kit. under $50 about 2 hours to swap out.
My friends 190SL had that part seize and break the upper A arm hole where the kit attaches.
Cost him some bucks because I didn't do the work.Just did the diagnosis.
The inner side of the A arm is a nightmare to get access.
It's the lock plates (171) for those two bolts connecting to the sub-frame.