My brother inlaw just purchased a Gravely 818T in nice shape with wheel weights and a 48" deck. He is looking to buy a snowblower. What blowers fit the tractor? Are they hard to find? what should he expect to pay? Is there any other blower that Gravely owners have modified to fit these tractors. We are both new to Gravely garden tractors so any help would be great! Thnaks!!