Zetec - Kubota tractor alternator / rectifier question.

I think this was something that was supplied by quicksilver at one time as a kit for an FC zetec engine mounted alternator.

I am looking for a spare replacement Alternator. Figured someone on the apex would have an idea what year and model Kubota this is from ? or if their is an uprated/alternate model that fits same setup.

Also I noticed this is an AC generator setup that goes to a rectifier converting AC to DC voltage output. Any recommendations or uprated suggestions on this.

Zetec - Kubota tractor alternator / rectifier question.