I need to get some wheel weights and tire chains for the rear of my 2120. Can anyone tell me what "size" weights and chains I need. The rear tires say 14.9-26 on a 13 inch rim. I'd like to find some used weights and am wondering what tractors would have the same size wheel (8N, 9N, etc). Same deal with chains, if I could find a good used set i was wondering what the length and width would have to be.