Miniature light bulb for any 1969-70 Mercury Cougar Standard Model with the door ajar feature. Non-XR7 Cougars, but with the convenience group option. Original equipment GE 257 light bulb. This is a flashing light bulb. It has a metal strip that heats up and breaks contact for a flashing effect. Starts out with the bulb on, and eventually starts flashing over a period of a few seconds.