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You just compare them to your old rotors. Type I and Type II rotors look identical at first glance, but you'll find that Type II rotors are about 5mm thicker ~ so just compare what you got to what you had on your car previous.

Type I rotors WILL work with Type II brakes, however since the rotor is thinner the caliper pistons may overextend when the brake pads approach the end of their service life.
 
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