I retrofitted an OEM camera to my E46 coupe and I am pretty sure it came with a list of all the parts in the kit and part numbers, I'll check it later in the week.

Also there isn't a module as such if you have TV fitted. Without a TV then there is a separate module which doesn't come with the kit.

I hooked mine up as per the EBA so it turns the camera on when reverse is engaged, it is also set to flick back straight away when you come out of reverse. Originally it is set up to hold the image for 5 seconds, but if you cut a wire it switches instantly. It sources the power off the reverse light.

What are you fitting it to E53? It is not an easy retrofit on the E46.