Power Steering Help
 

I've got a slow leak in a power steering hose in my 1990 300ZX NA. I've narrowed it down to the rubber hose that runs from the back of the pump down around the alternator. Since the leak is very slow, I assume it s a low pressure return hose, but when i described the problem to a Z mechanic over the phone, he told me that that hose was a high pressure hose, and told me it'd be around $300 to replace. Thankfully, the pump is new, so I don't need to replace that. But can anyone definately tell what kind of hose this is so I know exactly what I need to tell them to replace without getting ripped off? Thanks.