Okay, the camo mount hasn't arrived yet but the one that came with my used Super Nova is made by Weaver and it is part # 48443 423M. It says "one piece base used on Benelli Nova Shot". It won't work with my Tactical model as the rear ghost ring is in the way but the holes seem to line up just fine otherwise.
The camo model will be in tomorrow and I'll update you on that one once it arrives.