There are 5 different 944 front rotors:
1) Early NA, 282x20.4mm, mounts on the back of the hub with 5 screws
2) Early T, 298x28mm, mounts on the back of the hub with 5 screws.
3) Late NA, 282x20.4mm, mounts on the front of the hub
4) Late T, 298x28mm, mounts on the front of the hub
5) Turbo S, 304x33mm, mounts on the fornt of the hub
There are 4 different rear rotors (all mounted to front of hub):
1)Early NA - 290x20.4mm
2) Early T - 86 only, 299x28mm
3) Late NA - 86+, 290x20.4mm, alum arms
4) Late T - 87+, 290x20.4mm, alum arms
(Early and late rear rotor differ by their pilot diameter, technically the late rotor will fit and early hub, but the pilot sizes don't match and you'll by radially positioning the rotor with only the retaining screws......)
Easy,
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