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http://www.used-police-cars.com/2003-police-interceptor.html
basically want you want is rotors for the police package car, from 95-up. i think that will require that you use the 95-rear discs but for the vented rotors, i'm going for that. Ultrastangs competitor (Vintage Venom) sell ready to go CV rear disc kits with the vented rotors as well.
i've also been considering swapping on the 12" front rotors at some point as well, but we'll just have to wait and see
I think the ventilated rear discs, for the Crown Vics, are an aftermarket offering, --unless those rotors come on the Crown Vics after 2002 (??). I have not seen the setup on a C-V later than 2002.
All C-V rear rotors from 1992-2002, whether for civilian cars or for police interceptors/taxis, are of a solid rotor design.
The only differences, I know of, between the '92-'95 and then the '96-'02 C-V police/taxi rear brakes vs. the civilian C-V rear brakes is the fact that the police/taxis have stainless steel caliper pistons and that they use semi-metallic pads. The civillian C-V rear brakes use regular pads and have phenolic caliper pistons --although the phenolic pistons can be swapped out for the stainless ones --they are the same calipers.