Our 1974-1980 Mercury Cougar Radios are made to order. We will need exact dimensions in order to get the perfect radio built for your Mercury Cougar. We have three different models you can choose from. Our USA-230 Model is your basic AM/FM radio, with an aux port. The USA-630 is our most popular radio. This radio comes with a USB port ,an AUX port, and is compatible with our bluetooth adapter kit. You can also add our single disc CD changer to this stereo. Our USA-740 model is our newest model. It is an upgraded radio that now comes with integrated bluetooth, as well as a USB and AUX port and many more cool features. Call today and speak with one of our specialists and we'll help you choose the right one for your 1974-1980 Mercury Cougar vehicle.