Good rear rotors for 07 F550?

[RamAirfreak98ss]

We need replacement rear rotors for a 2007 F550 truck with a 12' dump on it.. local shops can get wearevers "cheap stuff" for $115-145 range.. im more concerned with the fact that the garbage iron rotors just rust so bad after a year, even if not driven a lot of milage, that just like rotors we're replacing "that had 95% meat left on them", theyre rusted beyond belief... I want to get a coated rotor, like the ones that are black or painted on the hat part at least....

Online it seems most companies like Plowerslot or stoptech only make front rotor replacements? Rotors are same size front and rear, but rears have the big axle so they bolt to the hub differently and are not the same as the fronts..