on my aftermarket lights they are right on the inside of the light, right next to the grill. mine are right next to the inward pull tab. i really can't remember what the stock lights look like though, if you pull the headlight out you should be able the see the adjuster with no problem.

 

Here is a pic of one of the screw.


There is also another one for left and right adjustment inside the headlight, near where the bulbs are. You gotta take the assembly off to see that one.

 

thanks 90lxstang, would of gone and took a picture but its dark and too damn cold here in michigan [:@]

 

there is a how-to in your manual i think u back up 25' form a wall and they should line up parallel with the ground and be the same height as your lights are form the ground on your car, very easy to adjust with the phillips screw driver, dont take it anywhere to have it done