Well, these work great. I bought 3 of them, and I'm all set. Digi-Key part number
It is a snug fit, but secure, and seems to match up and fit perfectly. Digi-Key has a great search function. I believe I started with connectors, 4 pin, terminal block, 3.81 centered and screw type... quickly several selections became apparent, and some of them had different ways to be secured beyond friction, so it was narrowed down pretty quickly.
I'm sure there is a similar version in Black if that is your choice but know at least that this plug, from Phoenix in green does work properly.