Here is the link that I used to buy them. I haven't had a chance to check if they work or not, but I didn't see any documentation of what size they are. The only thing I can say is that it is very close to the size of a normal XLR connector.
https://www.amazon.com/Outdoor-Lights-Waterproof-Connectors-Extension/dp/B07T512RHZ?th=1
I think I found the exact cables on Amazon. But thanks a lot for replying.
https://www.amazon.com/Outdoor-Lights-Waterproof-Connectors-Extension/dp/B07T512RHZ?th=1