Somebody call me out if that's wrong...
14 and 15 woofers are odd ducks in the Altec woofer world. The 14 woofer has a bit more motor than the 15, but neither have the 3 inch VC of the 414 motor. Yet the bigger challenge is the mounting diameter and bolt circle, odd dimensions as the stock woofers have a 1 inch wide mounting rim and gasket. Overall diameter of my model 15 woofers is 13-1/2 inches.