The newer design as shown in the picture up above had several design changes. It incorporated some type of a plastic floating valve inside that rattles when you shake it. The size of the return hose was enlarged. GM no longer has the dedicated hoses for that application so you just need 2 different sizes of power steering hose. The larger of the hoses is sold by at least Pep Boys in Kali. Comes in a box with a couple of feet exscess. If you don't run the newer style resevoir, it can whine, but the whine is an indication that the power steering pump is running out of power steering fluid due to aeriation. (Fluid does not return from the resevoir to the pump or steering box quick enough). In the meantime, Lucas Power Steering Restorer, a little pricey, will ease the job of the pump, but I would not depend on it solely or you run the risk of burning up the power steering pump/gear box. Also verify that the rotation of the cap on whichever new power steering resevoir that you buy matches the rotation of the one that you are replacing. It seems that the newer ones rotate opposite of the older ones and they do not come with caps. Buying a used one with matching cap might save you a few bucks as I don't think that the new caps are plentiful nor still stocked by GM. HTH.
There are 2 service bulletins regarding this subject written back in about late '86 or early '87.