The older hydro's had 2 bolts and a drain back hole so the gasket has 3 small hole to accommodate these. Later hydro's don't have the bolts or the drain back hole. When I replace the cork gasket if the hydro doesn't have the bolts and drain back hole I put the gasket on up side down. The 3 holes just weaken the gasket an make it more likely to rip.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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