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Kayaba piston band question

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Short version is I'm trying to help a friend get the shock back together on a 2009 crf450 and the previous guy that revalved it put this piston in with a wider than normal band. I've got suspension direct working on it, searched around and looked through the kayaba catalogue and so far no luck. Can't go back to the revalver because I'm staying out of that situation. Anyway it has 2 DU style bushings for piston bands. Od is 50, Id is 47 and they are about 6.85 wide. Groove on piston is 14 wide with oring grooves 2 wide and 1 deep. Here are 2 pictures and if anybody needs any more dimensions or pics to help please let me know. Thanks. Clay

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