http://www.ebay.com/itm/AIR-HAWK-2-A...#ht_3348wt_673

This one is 14 x 14 measure the seat and see if it will fit.....I have one for my wife for the Rune and she loves it and could not ride long distance w/o it......The trick to a air hawk is...very low air pressure, it looks like a carton on eggs...when aired correctly it will look under inflated...to check if you squeeze " one " of the egg thingys flat the rest stand up and appear full..hope this helps....then again the Russell seat is the answer!!!