I purchased a 166211(AYP) Sears mower deck for my older(1999) sears GT. Unfortunately the transmission went out (wish I knew about this site then) and I sold the tractor. I am now trying to sell the deck locally. An interested individual has a Sears tractor that takes a 166222 deck. I am trying to figure out the difference between the two decks and if the 166211 can be used to replace the 166222. Anybody know? AYP contact/rep? Thanks.