Xr250 gasket woes

Looking to put a wiseco 76mm oversize piston in an 87 Xr250, I read that the 1mm oversize 84-85 twin carb piston is 76mm and will work fine?

Have looked at cometic gaskets and I'm confused. Whats this difference between a SS and CFM head? there seem to be gaskets listed for 86-95 bikes with both head types?? also there are 74mm and 78mm gasket sizes which one for the 76mm piston?

try thumper racing in Texas. that is where I got my gasket when I did a top end on my xr280.

SS head gasket is stainless steel, cfm is probably a composite fiber/ asbestos gasket

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