Rebuilding Power steering hose for 112 (also 111 113 108/109)

Has anyone ever replaced or rebuilt the high pressure power steering line that connects the steering box to the throttle positioner on their 60’s Benz. (this increases rpm above idle when the steering wheel is turned)
Since this line is rebuildable, I’ve been looking for the 5mm ID x 15mm OD hose to use with my original fittings. This is for my 300se coupe, but a similar line is used in the 108/109, and I’m sure 111 and 113. Classic Center said my 112 part number is NLA.