Warbird Information Exchange

I am currently looking for an original or accurate copy of a mag on /off indicator
The unit itself is a bracket with red indicator that is on the outside of the fuselage. This unit attaches to the actual mag switch itself and moves with the on / off movement of the mag.
It's purpose was to enable a mechanic flipping a prop to see if the mags were live or not.

Please p.m. me if you have one or a lead

Thanks