Seals for Power Steering Pump (190E)

Has anyone tried to replace the seals on the Power Steering Pump on a 190E? I think it's a ZF pump (1993 190E). The problem is that the
pump shown in the Manual CD doesn't look like the pump that I have. I see four bolts on the pump housing, but the one in the Manual didn't have the four bolts. Any help would be appreciated.
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