The tires were on it when I bought the tractor (I paid about what the tires are worth). I'll check the size next time I go to the farm and I'll take a few more pictures.
The seat cushions were custom done at a local upholstery shop.
I think the muffler came from the local farm & home store (Orscheln's in this neck of the woods)
and it is still pretty loud. I like the idea one fellow hadd in adapting a JD 4020 muffler to fit, but I just don't know if I could get used to looking at that big black thing....