Thank you for the additional photos!
It's good to see the 479878 part number on the tag. That's what I guessed we'd see, which also explains the cast pistons.
Those are the main caps I expected to see as well. An interesting point worth noting is that all five caps were cast as a single unit, rough machined, cut apart, installed on the block and finished machined. That makes them a custom fit for that exact block and prevents installation into/onto another block without effort.
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