Yeah....no way those wings would fit without some serious bending or cutting, which sucks. If the "Clubman" style seat (available from Corbeau or Cobra) appeals to you, the best price I've found is from these guys:
http://www.laurelmountainmustang.com/
I just bought a Corbeau Clubman for $229 + $10 shipping.....hard to beat! (One big advantage the Clubman seat has over many others is the "wingless" shoulder section, which makes it fit in the 260 & 280 much more easily.)
Good luck with your install, whichever route you go!