In order to make things easier, we've put together a dedicated Jeep Grand Cherokee Lighting
page which discusses what bulbs the vehicle uses (depending on the model year).
You'll find information about which bulbs are used in the low beams, high beam, fog lights, Daytime running lights, and parking lights (Forward Lighting), and potential replacement bulbs.
Check it out - you'll find Grand Cherokee lighting data dating all the way back to 1993!!!