On most GM cars such as a N Body like the '97-'99 Cutlass, you should be able to remove the headrest. Pulling hard won't help because there is a stop. There should be two round plastic retainers on each leg of the headrest at the top seat cushion. To the inside of each is a plastic tab insert. If you remove that you should be able to get the headrest off. Look closely because the tabs are easy to miss.