This is a front kit only. I feel replacing the fronts only is just fine since over 70% of the stopping goes on up there. Heres info straight from the horses mouth. Read
FRONT Brake Kit
Vehicle application: Mercury Marauder '03+
Description: A six piston caliper and custom rotor kit to fit stock wheels offering a modest variety of rotor finishes. Alternate use on Marquis and Crown Vic?
Rotor size I: 13.1 Directional vane
Rotor size II:
Rotor width I: 1.10
Rotor width II:
Calipers, base: BSL6n
Calipers, optional I: Varied depending upon wheels
Calipers, optional II:
Calipers, optional III:
Base kits: Street Sport
13.1 x 1.10 with BSL6n calipers $1250
Notes: Alternate, larger kits on 14" rotors and utilizing new Wiwood calipers are in the works. Costs are estimated to be starting at $1500. Available in late 2003. Kit adds 1/16" spacer to each side for wheel clearance, included.
Installation level: 1 ( easiest)
Pads included: Yes. Q pads unless alternates ordered. Up charge applies.
Hoses included: Yes. Fronts only.
Rear kit available: Not at this time. Under development.
Options list/price (per kit)
Gas slot rotors $55
Zinc plate rotors $65
Drill or drill and slot rotors $125
Earl’s Solo Bleeders $20
http://www.tceperformanceproducts.com/BrakeKits/Marauder.mgi2