The mounting bracket is a short piece of 1" alum. angle. The "posts" are 10-24, flat head, machine screws with a couple of layers of heat shrink tubing.
As for the EC 300 2011 I have an `10 CRF 450 front number plate ! I used some cheap hardware on the mount and centered it back in to the socket that secured the headlight assy ! There is a taped hole in the upper triple tree from the factory and I just used it to fasten the the top !
I would Imagine that the EC 250 is the same ! I will post pictures tomorrow !
I think I bought $2.65 worth of metric nylon spacers(from ACE) to mount it with, and the numberplate was 26.99 form motosport!
Gofasters has a kit but it is very expensive ! No theirs is not worth it but I have budget !