It is item number 875.501153 I called the service center and they said the rebuild kit is around $90. I think I can buy a new descent quality jack for that amount. I just lifted the front of the 560SEL three hours ago and it is still holding. I may have not had the handle locked fully to the right when I tried to lift the diesel thus it didn't fully lock in the lift mode and dropped the car. I'm going to change the fluid out (it has never been changed) and see if it will continue to work.

I'm still in learning mode.