I spoke with Dave at TSP who said he has had one of these mystery pistons in his hands. He can't get any answers, so I can't either. Essentially GG pistons have always had a dome height of around 3.7mm. Measure the dome in your engine and it most likely will be.
All my spares measure the same. 2 x used wossners, the S3 in my 2018 model, and the S3 I have ready for piston time. I usually stick with the Wossners after the stock piston anyway.
And then each top end, spend the extra 2 mins to slowly turn the engine over, take a squish sample.. and then be happy everything is still as it should be.
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