Oldsmobile 1999 Silhouette - Manual (Page 335)

yellow blue
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8. Carefully put the bulb assembly back into the lamp
housing and tighten the black retainer ring in place.
Be careful not to damage the bulb on the headlamp
aiming bar.
9. Align the pins on the bottom of the headlamp
assembly with the holes in the lamp support bracket
while placing the holes in the assembly over the
bolts where the wing nuts attach.
10. Replace and tighten the wing nuts.
11. Replace the parking/turn signal lamp assembly by
lining up the tabs at the back of the assembly with
the holes in the fender.
12. Tighten the bolt connecting the parking/turn signal
lamp assembly. Be sure the tab from the
parking/turn signal lamp assembly is inboard of the
tab from the headlamp assembly.