I went through the same thing recently.
From what I understand, there are basically two types, flat face and Pioneer type fittings.
So you are looking for a male and female pioneer style fitting.
I don’t have the fish, but I have a small cross on my back window.
And don’t worry, we know y’all are still there.
All you have to do is look around and it’s pretty obvious.
I have bought replacements and spares by using just the serial number.
There are only a few different keys for each model. They should have them in stock.