mahilly

I have sourced a pair of 87 seats for my 67 mustang. The 87 seats were the standard low-back style, but I want to replace the covers with the high-back GT style. Can any one confirm if the 87 seat frames are the same for the low back and high back seats? or were they different sized frames? I have been told they are different frames, but I cannot find anything on the net to support this. Thanks.