Re: Swapping out parts
The windshield stuff is the same on both. The rollbar may or may not work. Early '79's had the same rollbar as your '76. Late '79 saw the front hoop attach at the shelf between the front floor and the rear floor. The '76 has the front hoop sitting on the rear fenderwell. It still might work though as the rear area on both is the same.
'75 CJ5,258 w/Howell EFI,T18a,4.27's,33's,On-board air,Warn 8274