After reading all the reviews for attaching the snow thrower to a riding lawn mower, I decided I needed the chains and wheel weight combo, and I am glad I bought them. We just got hit with 8" of snow last night. The weights are a little pricey, but they are made for the tractor, and very easy to install, with only two long bolts for each wheel. I highly reccomend them!
Craftsman 30 lb. Wheel Weights is recommended by Tatersalad