Man, I know the luck you're talking about. I went to buy a power steering hose and they tried to sell me a pressure hose for a buick century, even after I made it well known what I wanted he still tried to sell me a high pressure hose.
I would go to Nissan and get the part # for your brakes, then take it to the parts store and see if they can find the parts for you.
The ending to my story, ended up buying the power steering hose from Nissan. The damn thing was $80 for an all rubber hose.
I hope you have better luck.