How do I know which one is genuine on SM-RT66 rotors? One says made in China (SK) while other says Japan (RA). Both has different edges. Please confirm. Got china one from
SHIMANO DISCO RT66 6 FORI 180MM : Amazon.it: Auto e Moto
Rotori del freno a disco di SM RT66 di Shimano SLX epson DEORE 160mm 180mm 203mm MTB 6 tipo di bullone rotori del freno a disco 6 "7" 8 "parti di riciclaggio|6
シマノ 6ボルト ディスクブレーキローター 220/203/180/160 mm | SHIMANO BIKE(自転車部品)-日本