Like it says, piston rings. Will do custom rings for weird applications; you send them a piston. They ship it back with a complete set of rings for your motor. I asked about doing it "by the numbers" and they said this almost never works. They can guarantee the fit if they have your piston to fit them to. They did this for me with an obscure Mondial racing piston when I bought a set with a cracked ring. They really came through for me in a pinch. - Simon Favre <favres@engmail.ulinear.com>
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