They are threaded female M90x1 at the rear, roughly M29x? at the front. They're made of light alloy.
One came from Italy, the other from France. The dished one had a 135/6.8 Beryl, the flat one an 85/6.8 Beryl.
I ask because I'd like to sell them but don't feel right about selling them as mystery boards. I think knowing with they fit would make them easier to sell.
This post is not an offer to sell, it is a request for information.