This listing is for an OEM vintage Ski Doo snowmobile motor head gasket. The part number on this gasket is 420830310 and the hole size is 65.5mm.

I tried looking the part number up online but could not come up with an application for this number.

If you would like me to look at my old microfiche cards and see if this will fit your machine, email me and I can check for you and let you konw. 

If there are any questions about this item, feel free to email me. Thanks