The above NewWireMarine ones look good, i like the spring loaded cap.
Ex owner installed similar ones but with a rubber plug cap what comes off and when washing the boat it may get sprayed with water. I have no idea about the brand of mine, but they look as cheap ones from Amazon or similar what would make a replacement less expensive. I have mine now 2 seasons and they still work so no immediate self destroy quality.
One thing to mention is that you may look around and verify charging amps as on some thats low and can lead to excessive charging times, or no charging at all if phone is used to display something like charts, ActiveCaptain, etc.
For this reason i used for many years USB adapters for cigarette lighter as some of them have high charging amps, that would be another solution to not replace the plug you have.
Chris