Of course it depends on the radio, but MOST B bodies up thru 1970 , and A bodies thru 1976 are like the one pictured above . Takes only a few seconds to replace . However, 71-74 B body and E and C bodies are diffrent. E body AMs load through a socket on the side of the radio,
and 71-4 B body stereo and E body AM FM stereos have to have the dial lense removed first .

Greg