Go Wing Install

For e-bodies anyway, I don't think it's 100% true, for 1970. And it may only have to do with AAR-T/A type duck tail spoilers. I know they put in squarish holes in the inner panel to be able to access the fasteners for those type of spoilers. Since the AAR-T/A were a mid '70 model year package, the earlier '70 deck lids did not include those particular access holes.
Very nice dart. Welcome to FABO.