I bought mine from Hastings, they worked fine
Regards Dennie
D311 head info - post #21
Hastings ring number 2C7755
You can search their catalog https://www.hastingspistonrings.com/ring-finder
http://www.perfectengine.com/Hastings_2C7725_Piston_Ring_Set_p/has-2c7725.htm
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