are you sure they are ds 2000, and not 2500?(never heard of ds 2000, I may be wrong though) the 2500 have to be filed down top and bottom in order to move freely in the carrier. about 1 mm of clearance on each side you file will be ok. get rid of the metal shims. word is they catch dirt and debris
when I fitted mine they went in the carrier but had no play, even with the shims out, so definitely need a bit of file
discs easy to fit, just 2 bolts holding them to the hub. careful when removing, they might be rusty and snap, wd40 on them before just to be on the safe side