PIAA 580 Series - Manual (Page 7)

LAMP SERVICE
Bulb Retainer
Push down and out to release.
Slide insulator over connector.
When service is complete reverse steps to assemble lamp.
Make sure to not pinch wire while assembling.
The PIAA 580 lamps have replaceable H3 style bulbs.
Loosen the two lamp screws, do not remove them. When the screws are loose
enough, slide the lens and reflector unit from the housing.
lamp housing
H3 style bulb
lamp screws (2)
6.