Piston and rings

#1
Briggs 3.5 flathead mod 91202

Ordered a set of rings that are too thick to fit in the piston groves.
The factory rings are very thin 1/16in or so .

The new rings are twice is thick. Should i get a new piston for $15 to accomadte the new rings. Or just reorder the thinner rings.

The motor calls for either ring or either piston!
 
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