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#1
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I think the 510's are replacement calipers.That is what i have on my (Z).Dan,i would say yours are 100% correct.
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#2
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The "303" number is the Julian casting date of that specific caliper.
The actual caliper assembly date is stamped on the underside of the caliper (see the photo below), next to the hole for the disc brake retainer pins. Hope this helps. ![]() |
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