Get you Wilson (r) brand name aluminum baseball bat. Leave the ball at home. Go immediately but not sooner back to the very same "parts store" and confront the very same "clerk" who tried to sell you these hoses. While gently playing with the bat, I.E. tapping it on the counter, rolling it back and forth, and caressing it lovingly, explain to the "clerk" that he needs to go to the back and get the "actual" catalogue, and also mention that you have DISC BRAKES on your car, but when you mention your "DISC BRAKES" that would be the time to uh, um, ummm.. "tap" the bat on the counter for emphasis at the very same moment that you say the forementioned words.
If you don't get arrested, you'll get the right hoses.