Using mustang rotors for 4.5" bc

Hi,
My parts list from rockauto:

1. RAYBESTOS - 6004R
2. TIMKEN - 8121S
3. BCA - NBA6
4. BCA - NBA2

These are the parts I used. I took the original rotor and 6004R to machinist who replicated the inner diameters from one rotor to other (I also provided one set of bearing that I was using and the dust cove so he can cut the inner to proper size). Did a test fit, found out that the dustcover hole is smaller the the outside of the new rotor, cut that down as well and have been driving like that for the hole summer.