This is apparently a Mustang part - which is to say it almost fits a Cougar. The installation requires attaching to the vent duct mounting screws and removing the stock speaker studs - which is called out in the product description. The issue with fit is that the drivers side of my '68 dash panel has a recessed area that this speaker's housing doesn't account for. A little coercion on the speaker housing with my grinding wheel made it fit nicely.