Thanks for the reply.
I was just browsing ebay and see a few of those up for bid right now, lot of good deals.
I'm trying to find the seatpost diameter for my 2011 gt avalanche with no luck
I've found earlier models and they are 27.2 and I've found 2012 and they say 30.9, for the life of me I can't find a 2011.
I guess I'll have to get a metric tape tomorrow and measure it.