To get this back on topic (my fault) I think we can assume the Rejo would have used someone else's rear uprights, the question is who's - my guess is Elva but it's only a guess.
It might help if we had some photos of what is there or an idea of the dimensions.
At the end of the day, as long as it turns up with something period looking I don't think anyone will notice/complain - especially if he avoids going too quick!
Assuming it didn't do any International events in period there's no need to keep the FIA happy, so incontrovertible certified photographic period evidence should not be needed.
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