nvg --- what i need to attache to a helmet

i dont know what kind it is. i cant find any attachement that fit on it . the mount is attach to the nvg with 4 scews.
 
Looks like the ones in my office... Does it happen to have a maple leaf on the front lense cap, or tag anywhere that has a NSN or say AN/PVS-504A/B?
 
I don’t see a photo in this post. Could you send one? I have a few helmet mount options but need to see what you have
 
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