The different caliper halves have different number depending on what standard they are desinged to bolt onto (IS, postmount etc) and what size disk they work with.
No3 Half used for 185mm Front or 165mm Rear International Standard 51mm Mount
No5 Half used for 165mm Front or 145mm Rear International Standard 51mm Mount
No8 Half used for 205mm Front or 185mm Rear International Standard 51mm Mount
No4 Half used for 185mm Front Formula 48.5mm Mount
No6 Half used for 205mm Front Boxxer 51mm Mount
No9 Half used for 165mm Front Hayes 68mm Mount
No9:74 Half used for 165mm Front Hayes 74mm Mount
No11 Half used for 205mm Front Hayes 74mm Mount
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