This might be another not so smart question but would the threads on the box differ from years or would they all be the same?  I would think they would all be the same but sometimes you never know.

Well not knowing the yaer of the parts it'll be interesting. I ordered thep part that Duffil said was the part# . the hose will be for an 81 box if it doesn't work then according to Napa , they can special order an 80 yr model we'll see i'll keep ya posted.
Good question tho,btw the pressure port on the pump and box are 16mm the low press. are 14mm FYI....