I vote for the 68 Hemi cars. The SBP aluminum would probably get my vote for surviving, because a number of them were exchanged. The ones we see on cars now survived because of a few stubborn owners, not because only a few were installed at the factory.
Think rear shoulder belts would have been a dealer installed option cause. The Demon does not have tapped bolt holes for rear belts.
Sunroofs, both cloth and metal, number into the thousands according to Govier's book.:snakeman: