Xtra 10 121" came out in 96. Not sure of the 136" version, but the GenII SKS and RMK were both using them. Edge came out in it's current form in '01. There were a few '99 and '00, but they're much different. Edge is a 121" only. Polaris hasn't built a factory installed 136" since the Extra (until this new '08 anyway). 133.5" are not Xtra or Edge.