Multiple listings for the same brand and type of part merely indicate different suppliers. Unless otherwise noted, they are the same part.
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Four-piston Caliper Front Right, "big Black" ... - New/Replacement
S92835142403
This part is no longer available.
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Brake Caliper - No Longer Available - Genuine Porsche
G92835142403
This part is no longer available.
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Genuine Porsche Brake Caliper - New/Replacement
R92835142403
This part is no longer available.
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Caliper 928 Gts - Front - Right - New/Replacement
T92835142403
This part is no longer available.