My '74 LeSabre has a two-piece fiberglass parade boot for the convertible top. It slips under the chrome molding at the rear of the seat and is held in front by two Dzus style fasteners in the plastic trim pieces on each side of the seat. Was this a factory option? There doesn't seem to be any provision for a soft boot.
It was called the "Customline" cover and was first available on 71 Cadillac Eldorado and then Buick LeSabre and Centurions starting in 1972. There is some proof that they were also available on 72 Oldsmobiles for a brief time. They will fit on any of the scissor full size GM's but were not offered on any of the other lines aka Pontiac, Chevy, and Olds after that possible first year Olds offering . There was actually a company that reproduced them and also all the clips and hardware. A good thing to find or have made is one of the bags to put them in when not in use, it is a large vinyl sack with a divider to keep the two halves from rubbing and takes alot of the worry out of scratching or damaging them when they are in the trunk.
