That car hasn't been messed with much, still has the rubber plug in the alignment hole.... The third bolt is accessed through the hole in the top mechanism & the bar holding the top in the previous photo isn't aluminum it's a galvanized channel with a dense cardboard material filler the top is stapled to that filler material....

"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."