Tech Question - 300mm rear brakes.

[ossie cossie]

I was looking through my bits today and came across the 300mm rear kit i have, it has black bells with 204mm 8 inch PCD and 12 off M6 bolt holes, on the back it has C41 203R engraved on the bells.
I also have another pair of bells only that are black as well but these are 178mm / 7 inch PCD and 12 of M6 bolt holes. what disc rotors do i need to get for these bells in order so that i can make another full set of 300mm brakes.
Thanks.

[ossie cossie]

BTTT ?

[Davecos 4x4]

Mike R or Reyland would be the ones to ask as they supply the full kits.