Item 4475336171ZF has must read information.
: This item is not interchangeable for machines built prior to S/N 0160000001. If replacing this part, you must order the complete seal kit part number 7029104. Please accept our apologies for the inconvenience, This is due to changes made by the axle manufacturer and is beyond our control. This part is interchangable on machines S/N 0160000001 and later.
: see note 4 

ZF-PISTON

$590.02
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4475336171ZF

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: 7.5  : 7.5  : 2  : 6.703

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EA
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ZF-PISTON - 4475336171ZF