Okay so my boyfriend has a 1972 chevy truck and I want to buy an indash stereo for him for Christmas (he's still fixing it up and the radio doesn't work). Do I need measurements of his dash or should I look for any specific indash stereos for his type of truck? I don't want to buy a stereo that won't fit or doesn't work for his truck, so any type advice would be very helpful! Thanks a lot 