Part has stamped on it Truth 30472 R.H.

Hi there, Tom. I'd say to take a closer look into the 39-032 entry gard operator. Carefully review our measurements to confirm they are a match to yours. 

Actually, I have an update for this. I noted that your link arm is especially short; maybe too short for the 39-032 to work. See our 39-333 instead. This may be a closer match, but as before I highly recommend confirming your dimensions.