Here is a piece that will allow to install a modern DIN radio / CD player into your Mercury Cougar or Ford Mustang. No hacking or cutting required!
*TRIVIA* Here's some alphabet soup for you. DIN stands for Duetch Industri Normen. An abbreviation for a standard in-dash radio measurement which is approximately 2 inches by 7 inches. The Germans starting using it to standardize the radio size in Audi, BMW, Mercedes, and VW way back in the mid 80.