The 124 diesel wagon did not have the hydraulic pump cast into the engine head like the 123 wagon did. Rather, the 124 wagon uses a so-called "tandem-pump" to power both the self leveling and the power steering. It's really two separate pumps built into one. It has a standard reservoir and pump for the power steering. It also has fittings for a separate pump to draw from the self leveling reservoir and feed the suspension.

I'm not certain the engine castings are identical between the sedan and wagon, but I very much suspect they are. Most likely the differences lie only in the pump, or at most the pump+mounting bracket.

My $.02,

- JimY