The P77 will drop in just like a factory stereo. I have had my P47 for about a year now and love it. I would buy one for my 95' wagon in a heartbeat. The best part is that it has a volume knob. No fumbling for little levers or buttons to turn your tunes down. Also, they don't protrude from the dash like aftermarket Din 1/2's that use the adapter kit.