You can get the Starting Device #67005560
Or you can get just the Capacitor
The relay checks out according to the service manual. The capacitor did not. I put in a used one of the same specs, and it started up fine.
I'm still relatively inexperienced with everything, but it seems that the capacitor in this set up gives temporary voltage to the start wiring, while constant goes to the run wiring. If the thing is trying to start off of one winding only, I'd expect to hear it until the overload clicks off. That's what I got, and swapping out the capacitors fixed that.
I'm just letting it run to see if it goes through its defrost cycle fine and that it maintains a good temp. If not, the customer wants to condemn the machine (spare fridge), so we'll avoid the cost of the capacitor.
So far, so good. Good temp, no frost. If all is ok tomorrow, we'll get the capacitor, and close the ticket.
Thanks for the help, all!