I am getting very confused looking at parts catalogs for my 1966 Ninety eight LS.

So whats the difference between a "4 Door Sedan" and a "4 Door Hardtop"????

Mine is a 4 door what I assume is a hardtop cause its not a convertible but had a vinyl roof.

 

Four door sedan has a post between the side windows. Hardtop doesn't.

 

And the four door hardtop is also called a 'Holiday sedan'...

 

1965-68 LS are what's called a "pillared hardtop". They have B pillars but frameless door glass.

1963-64 LS are poshly trimmed high-top 4-door six-window hardtops with no B-pillar. Cadillac and Buick Electra also used this body style. Roofline is physically taller than the Holiday 4-door hardtop.

1969-70 could be either a Luxury Pillared Sedan or a Luxury Hardtop Sedan. Same interior trim level, just one had frameless glass/pillars and the other was a true hardtop with no B-post.

1965-70 LS were available with or without vinyl roof cover. The key to an LS is the interior, with the high-back front seat, LS-identifier door pulls, and the vanity set and storage pouches on back of the front seat.