Google gives me this for 3588 https://www.tractordata.com/farm-tractors/000/3/8/381-intern...
I guess giving up a life of computing and starting a life of vintage tractorring is pretty compelling, but I don't think they're making new batches of 1981 tractors; but who knows what VW is up to these days.
OTOH, DuckDuckGo gave me California tax forms. No thanks!