They only made a few mk6 rs2000 with the disc rear beam mate, and i mean only a few,
They were mainly found on the the xr3i, mk5 rs2000 and the mk5b rs2000.
If your fitting it to a mk6 escort and you dont have abs its just a matter of removing the old beam and fitting your xr3i beam.
But if you have abs then you will have to modify and fit the ford focus rear disc set up

xr3i and rs2000 have the same rear disc set up and will bolt to any mk5/mk5b and mk6