What piston is #5796K ??

I bought a 2002 yz250 from a guy and it has paperwork showing that it has a 265 kit from Eric Gorr. I just want to make sure I order the right piston so I pulled the dome to see what number it is and it says 5796K on the top of the piston.

Does anyone know exactly who makes this?

I was going to order the Wiseco kit PK1201 since that is what the owner told me to run...

Just want to make sure.


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