Why not ask Roman for the measurements he used? If you get even one of the measurements wrong the pistons could be unusable, it's not something you want to guess at.
I'm using new forged Oettinger pistons in my engine (they were made for Oettinger's 300E-24 3.6 conversion) and I had to get some bearings custom made so that they could connect to the rods properly.

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1989 300CE "Project HWA124"
(400rwhp Turbo Technics AMG C36 engine)