front quarter panels interchangable

It looks like you are in the market for fiberglass fenders as replacements I assume?

On the website you provided a link to it shows as being compatible with 70-76 and I think the reason that is ....is because the fender is basically "gutted" no headlight bucket,no mounting tabs for the header panel (hood latch panel or whatever you want to call it) ......which I believe is the difference between 70-72 and 73-76 fenders (atleast for dusters I know) is that the 70-72 fenders had a mounting tab on them for the hood latch support panel to bolt to where as the 73-76 fenders the tab was non existent I believe .

however a key difference from a duster fender to a dart sport fender is the wheel well opening.

if you go to google and type in dart sport and look at the images....you will notice the rear section of the wheel well swoops back towards the door.

where as if you look at a picture of a duster you will notice the wheel well is more of a half circle and is symmetrical on both sides of the wheel well.

I am not sure if you are specifically looking for fiberglass replacements or not....but you may find you have better luck looking right here on fabo's classifieds for a set of steel ones removed from a dart sport.

or you could convert the entire front end over to a different year/model if it means the parts you need are easier to find.

also I am not sure who offers them but I know I have seen them on a few cars before so someone makes them for our a-bodies.....but you could also look into an entire one piece fiberglass front end (hood and fenders and everything molded into one piece).

just wanted to toss a few ideas out there. hope some of that helps.