1987 300E Leaking Power Steering Box

[JerryWagner]

I crawled under my daughter's 87 300E to find the powersteering leak expecting to find a broken hose and it appears that the steering box at the end of the steering column is leaking, can anyone let me know my options on fixing this, it looks like the box is held on by 3 bolts on the frame and 2 hose connections, not sure how it connects to the suspension and column, should I get one from the local boneyard or rebuild this one or buy a rebuilt, any insight would be appreciated, How interchangable are the steering boxes between the different years of 300E's thanks in advance