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got to have parts books. while both cylinders have the same bore diameters the books show different part numbers. These part numbers include the piston kits with them.
2006
16525-99 silver
16526-99 black
2007
17458-07 black
17459-07 silver
I would think that the jugs were the same in these kits and that the pistons change because of the stroker flywheels in the 2007 Model year. This would account for the different part numbers.
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