What you need is a Cutler-Hammer bulletin 598 relay. They were used in square-dial 10EE DC control panels for both the motor/generator and Works in a Drawer (WiaD) drives.
(I changed the title of your thread to reflect what you actually need.)
I'm not aware of any new replacements. I reached out to a guy that has some DC panel parts; we'll see if he responds.
Brazil Motors & Controls in Portland, OR has a lot of vintage electrical parts. You could give them a try. Two possible phone numbers: (503) 765-8333 and (503) 227-4973, not sure which is correct.
The guy with the DC panel parts is still around. He's going to see what he has left. At one point he had two sets of 598 forward/reverse contactors and three field acceleration (FA) relays.
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