I am trying to install rear "Air Ride" springs on my 2013 Grand Caravan SXT. I have confirmed that I have the correct kit (60814). I have it all pulled apart, and ready to install the air bags. I can NOT get an 3 3/4" diameter air bag through the bottom of the spring that measures at most 2 3/4". The top of the spring also measures 2 3/4" Any ideas? Unfortunately, the company is closed today.