I am looking to upgrade my son's sled. He currently is riding a Phazer II long track. He is still wanting to stay with a 136" track. He really doesn't care for the size of the SX, Viper SRX ect. I want to stay with a Yamaha for durabilitly. I would like him to have a 600 SX MM. The one item he does not like on my 99 SX is the seat size. The extra padding on the tunnel specifically, does the Mountain Max have the same types of seats as the VIpers, SRX's?