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We're talking about 4 piston caliper here, right? If so then it's easy.

P/N is 41121-30P00 for a piston, you obviously need 8 of them per car.

You may want to buy a seal kit for pistons as well. Its

P/N is 41120-30P25, apparently you need only one per car.

P/Ns are identical for any Sumitomo Nissan 4 piston caliper, be it 300ZX, Silvia or Skyline. As for availability, I think you should check it with a dealer.

Edited by Legionnaire

Depending on what genuine charge, the better option is to get Project Mu's caliper rebuild kit. They use alloy pistons, which compared to the standard pistons save about 400grams, which is all unsprung, so handling benefits from the change. I used the PMu caliper rebuild kits in my Impreza rally car (exact same sumitomo calipers as the Skylines) and it was far cheaper to get he Pmu kits (which include the seals etc.) than it was to buy genuine.

The kits to suit are $429 for the front (both calipers, ie 8 pistons and seals), and $265 for the rear (again both calipers).

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