Oldsmobile 2001 Silhouette - Manual (Page 364)

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7. Install the new bulb through the black retainer ring
and into the electrical connector. Tighten the black
retainer ring in place. Push the bulb firmly enough so
that the blue tabs hook over the tab on the bulb.
8. Carefully put the bulb assembly back into the lamp
housing. Be careful not to damage the bulb on the
headlamp aiming bar.