Basically 3 parts to the light.

Cover housing (front): *carefully* prise (Brit term I love from my Brit Haynes manual) the tab on either side to release cover.

Main body: there are 2 black spring loaded tabs on each side of the bulb about 3/8" (~10mm for the metric crowd) wide. Moving them will allow removing the main body from

The base: which is attached to the rear parcel (hat) shelf from the bottom. Shouldn't need to remove.

Be careful... all that plastic gets very brittle with age sitting there in the sun.

Does that help?