A.D.
Sunshine Kids, Radian or Monterey, they are all cut far narrower than the Graco and Evenflos. http://us.diono.com/en/car-seats
Hopefully the link will work otherwise it's www.skjp.com, they're not as cheap as a Graco or Evenflo but they are VERY highly rated for crash testing.
ETA I just looked on Lonestar Baby and Kids and it looks like they're on clearance.