Okay well my dad just bought a 1966 for mustang for me and him to drive(mid life crisis.lol) I want to know what speakers would be bst for this type of vehicle. He listens to old rock and i listen to rap and techno. I no that these music types are the opposite, but what is a good cheap happy medium? My dad is a lil cheap when it comes to electronics.
The bigger question is where you are going to put them. Those Mustangs have tons of kick panel space, but that will of course require that you fiberglass kicks for the car. The doors are a decent location, but unless you already have the door grill I definately wouldn't cut into them because there is no way you could repair it if you wanted to take the speakers out in the future. Bad side of the vinyl-grained metal on the doors.
Other question is are you running them off a head unit, or do you plan an amplifier in the future?
Before you buy Diamond Audio speakers, double check the country of origin. It is made in China. If you're lucky, you might find one made elsewhere. Don't get fooled by the brand name. Lot of them have shifted their manufacturing plant.