Just go to your local auto zone or car parts shop and tell them the make and model of the car and they can look it up and point you to the right one.
pictures of how to change front signal bulbs on a 2004 grand prix pontiac
On some, you can get to the back of the light assy and take the bulbs out. If not, the assy has to come off
Get a light insert it in the car! obvious
Sounds like a problem with the switch in steering column
how to fix the light for the clock radio in a 2003 Pontiac grand am
Generally, the tail "light" and the tail light "blinker" are two different bulbs. Check the blinker bulb first. If it is OK, then it is likely a fuse to a flasher unit.
cheack the wireing
3 big plastic wing nuts hold the tail light assembly in the body. remove those and the tail light can be removed to gain access to the bulbs.
what light, there are a lot of them.
Age. If it is the bulb in the instrument cluster change all the bulbs at the same time.
Sounds like the signal switch is at fault.
No. Also ensure all light bulbs and fuses are good.