Not a close Colt copy, doubt the rod will fit.
If it is the Liberty Chief, Numrich has the ejector rod.
https://www.gunpartscorp.com/products/613530
They do not have the ejector rod for the Miroku Police Special in stock.
I googled complete parts sets for both models, apparently confiscated guns kept "off the street" by cutting the frame in half, but that would be an expensive solution.