What's the difference between W/O DSC, W/DSC?

Hi, rotary guys.

I'm not good at English. sorry :)



My rear break pipe(left and right) was damaged(fortunately, no leaks)

so, I read the FSM(factory service manual) and I found break pipe's part number.



Top of that page, printed "W/O DSC" and other page was "W/DSC"



Look at this link.

BRAKE PIPINGS. Fits: Mazda | Jim Ellis Mazda



Rear Right break pipe: 45360A

Rear Left break pipe: 45370A



There are difference in prices W/O DSC, W/DSC.



I need to find correct part number for my rx-8(4-speed automatic, 2004, USA)



please help :)