Sorry for the slow response, Ravvin and Britbobby. I've just enabled notifications so hopefully my responses will be more timely going forward.
Ravvin, yep, the Discovery 1 reservoir did the trick.
Britbobby, thanks for the welcome--East coast to boot! I was looking for the hose for the steering box return to reservoir. The original appeared to be a high compression hose. It's been swapped out for a low pressure hydraulic hose (SR6 SAE 100R6/EN 854 R6).
No leaks yet, but if something pops up, I'll take Ravvin's advice regarding putting goop on the barbs.
Thanks, all!