a set of bf Goodrich lt 325 60 r 20 has cracked and Canadian prices are about 500 to 600 per tire.....do I have to use this size or will another fit I know the radius has to be 20 but I found a set of cheaper tires the dimensions say 35 x 12.5 r20 e man I hope they will fit as they are 224 bucks Haida mud champs hd868. these tire sizes and things seem confussuin any help is really appreciated