You can purchase these from MNNTHBX

MFG Description:

Streamline the profile of your Honda Monkey with our MNNTHBX signal / headlight mounts. CNC machined HDPE. Accommodates M8 threaded signals of your choosing, or add our Rizoma signals. Minimal size, classic lines that fit the monkey aesthetic, and the brightest signals made. DO NOT let the size of these signals fool you. they are FAR more visible than the OEM signal. Shaves nearly 1lb. off the bike. Plates and signals sold in pairs.