I just bought a Specialized Vita, and when I got it home, found that my trusty old Delta Mega Rack won't fit on it, because the rear end on the new bike is 1.5" wider than on my old one. The mounting holes on my bike are 7" apart, as opposed to the 5.5" distance on my old Trek. Any suggestions? I don't live all that close to an LBS, so would prefer to buy online if I can swing it.