Ford 3910, John Deere 420C, Kubota G32XKS, IH 2606, Bad Boy Maverick-60"
When I built my "Kenbota", I replaced the dynamo with an alternator. IIRC, it was out of a 1987 Subaru Justy. I used that one because it wasn't too much larger than the dynamo and it had a built-in regulator. That and I happen to have one sitting on the shelf.
The first picture is of the install and relative size of the alternator. The second picture is how I connected it. The connections are the same as a GM SI-10 alternator.