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This retaining ring fits the engines below.
Yanmar 1GM
Yanmar 2GM
Yanmar 2GM20
Yanmar 2GM20F
Yanmar 3GM
Yanmar 3GM30
Yanmar 3GM30F
Yanmar 3GMF
This 0.25 oversized piston fits the engines below. Yanmar 1GM10 Yanmar 2GM20, Yanmar 2GM20 EU, Yanmar 2GM20F, Yanmar 2GM20F EU Yanmar 3GM30, Yanmar 3GM30 EU, Yanmar 3GM30F, Yanmar 3GM30F EU