kubota G-12

Just talked to a freind who is trying to work on a kubota G 12 and hadnt been able to find any manual or parts. Its been sitting probley 15-20 years and turns over but no spark. He was thinking that he cant get parts for it. Any body on here no where to get parts or where to look. He even is considering selling it, is their andy interest in these. I remember this tractor from when we were you and it was a good garden tractor. thanks