I would have thought that so long as the outside diameter of the disc is the same as your current ones, you shouldn't have any problems. Although, are all discs the same thickness? I seem to remember a thread on here a while ago where someone had mentioned pads binding because a replacement disc was slightly thicker than the original
And yeah – SSC pads are rubbish, ahem:
I put some on in late March/early April this year and there's still plenty of pad left. This is unacceptable for organic pads that cost £5.
As well as my normal riding around gritty Thetford, I've only done the Wiggle Enduro 6, a week in the Sierra Nevada Mountains, 2 of the 3 4hr Summer Series races at Thetford, 24/12, Dusk to Dawn, a couple of Peaks/Wales weekends inlcuding one a couple of weeks ago that took in Penmachno on the Saturday, Cader Idris on Saturday & the MBR at CyB on Sunday.
I won't be buying them again for a while – mainly because I bought 4 pairs in one go, so the other set should keep me going through most of the winter. 😉