Tire for older model Craftsman ride on mower

[Betrina]

I have an old Craftsman ride on mower and need a new back tire. the sears parts said that the model number 944.601020 is too old to look up a tire. Does anyone know where I can find out and buy a tire for the model? Or is there a similar tire that fits another model that will fit mine also?
I am in Canada.

 

[panabiker]

If you still have the old tire, there should be size info written on it. Something like 20x8x8? If so, you can buy the same size tire and forget about the model number.