Parker Repro 28ga, missing Forearm Ejector parts.
 

I'm in need of a little help: I recently acquired a Parker Repro 28ga.DHE. For this gun, a prior owner had the Ejector parts removed from the forearm iron, rendering the quite nice gun as an extractor gun which works just fine.

However, I would like to find and reapply the proper working parts/hardware to bring this gun to its original factory state again as a true DHE. Any help, guidance or direction to either locate the correct part(s) or if possible to retro fit from a original parts would be most appreciated. Thanks, Mark