Nova Mega is manufactured by Novarossi as well, so the carb should fit as long as the neck is the same size. However, Nova Mega is more designed towards onroad racing which could have some different designs which you cannot see. Price wise, I think its ex but not unreasonable as that the norm at LHS. Personally, I will not use a carb design for onroad in P5. My 6 cents.

Cheers