Hey all, been a loooooong time since I've visited. Had a 72 Supreme, restored it, sold it, miss it, etc. I'm kinda rusty on nomenclature, so here is my question. What exactly is difference between hardtop, coupe, hardtop-coupe, ( I know what a convertible is) . I have a left over front door glass from above mentioned car. A guy wants to put it in a 72 Chevelle convertible. As far as I have determined, the Supreme body style would be considered a hard top, and my interchange book says it will fit a Chevelle convertible. Just need some clarification here, thanks Chumley

 

A coupe is a two door (despite what Mercedes and other German car companies may claim).
A hardtop coupe has no post (no B-pillar)
A sport coupe has a post and frames around the door windows.

All 1970-72 Supreme 2drs with the notchback rooflines are considered hardtops (Fisher Body 4257 code). All 1970-72 A-body front door glass from hardtops and convertibles interchange.

 

Just to add to Joe's comment, the model 3287 and 3687 also are classified as 2 door coupes. (pillarless) As far as interchange ALL 2 door Cutlass hardtop coupes (aka Holiday Coupes) doors and glass interchange, so whether CS or Cutlass S coupes it's the same animal for doors and glass. Very likely the same glass will interchange with Chev, Pontiac and Buick.

 

As I noted above, door glass on ALL GM A-body hardtop coupes and convertibles interchange for 70-72. That's xx57, xx67, and xx87 body styles.

 

Thanks, there is still some fuzzy areas in my understanding, but from what you both describe I get from it that what I call fastback style ( Cutlass S ) and notchback (Supreme) both will interchange with each other, as well as convertibles and certain other GM A bodies. Sometimes there is too much terminology and repetitive designations in this area of auto manufacturers.

 

One point of clarification. 'Fastback' does refer to the Cutlass S and Cutlass models, but each of those also has a pillared model (ending in 77) where the door glass has to obviously be different to fit inside the run channels of the door pillar, and also having a side vent window. Cutlass Supreme Coupes are not affected by this distinction.
Fastback Hardtop Coupe


Fastback (Sports coupe - pillars) coupe