For others, there is an older post where a leak was found on the tranny cooler tube support shown in post 1. It happens after the plastic isolator falls out, so replace any missing ones. I used slit poly tube.

I changed both power steering hoses in one of my W123 300D's. I bought both hose stock on ebay, standard hydraulic hose for both. For HP hose, I used 2-wire type (3000 psi). The fittings unscrew w/ wrenches (see my post), as do the SLS hoses. For LP hose, I recall ~300 psig rating. I posted the PN's, so search if you want to repair yourself.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans