Power steering Pump on 1994 Mercedes-Benz E500

I have the 94 MB E500 and the PSP has gone out it also serves as a pump to equalize the rear shocks, Can a standard PSP be mounted on this vehicle? The rear shocks have been replaced by a factory authorized service shop with springs for the rear and no longer requires the pump to equalize the shocks. Please advise.

Asked by for the 1994 Mercedes-Benz E500
I really only see 1 Power Steering Pump available, and I see that it is PRICEY!!
It is basically still a PSP, many vehicles use the PSP as a central hydraulic system pumps i.e. most Diesel cars etc.