It looks like only the standard sized rear feather frames will fit onto your ski.
Small Rear Feather Frame boots (5-8) fit onto 65, 67" 2011 Radar Skis
Std. Feather Frames (7-11) fit onto all Radar Skis and Connelly/D3 hole pattern
XL Rear Feather Frames (10-14) fit onto 67, 69 and 71" 2011 Radar Skis