You would need to round up all the parts, but installation should be pretty simple. Worst part will be getting the level set properly at the controller.

However, the main reason it's missing may be an engine swap -- on most W123 engines, the hydraulic pump is on the engine, not the PS pump, and getting one with the pump is difficult (not that many wagons sold compared to sedans). If you have the pump attachment plated over, you can go ahead, but otherwise you must find a PS driven pump (it goes on the front on later models, under the pulley).

The parts, unless you happen on one in a junk yard, will be VERY expensive.....

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!