Save your money. I bought a Kubota mount and aftermarket Pioneer stereo and then mounted some speakers into the headliner.
The inherent cab noise, especially when running at PTO speeds pretty much cancels out an enjoyable stereo experience. It just has to be cranked too loud to hear it. I would not do it over again.
Spend your money on a set of noise canceling headphones with built in radio.
Some here have disagreed with me in the past and probably will again. But I can only speak of my own experience.