you might wanna make a parts wanted post, but I'd bet you'll never find one - the pto's ran hydraulics for dump beds and road plows, not 3 point hitch driveshaft equipment unless some haywire farmer [like Oly, who you won't be getting a mower or an answer from!] rigged them for some stationary use - you can justify the dump for the hauling alone, get a real mower for the grass instead of rutting up the fields with a truck
Bill