1972 Dodge Dart Radio Speaker Size?

Is the radio front speaker size for a 1972 Dodge Dart 4 x 10?

Is there a bracket you remove from the old speaker and put on the new one?

Anybody replace one from either Herbs or S & M Electro Tech?

http://www.herbsparts.com/search.asp?pg=1&stext=speaker&sprice=&stype=&scat=272

http://www.turnswitch.com/speakers.htm