I have the chrome bracket ,should come up ok with a polish.
Don't have the actual gate so your going to be bending one up.
I took the plastics off it years ago and put them in a box so they wouldn't get broken ,wouldn't have a clue where that box is now
I have the complete roto-target ,i pinched a single target off it to replace one on a Close Encounters once...came in handy ,just drilled it out and riveted it on.
What target face do you need ?? a 1 ,2 ,or 3.....i'll take it off and send to you with the gate bracket.
Message me with your address