There will be an angled bracket spot welded to the cantrail.
The year of your car, the interior light is surface mounted so will screw into the bracket.
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Later cars had a flush fitting lamp so the bracket would have a cut out for the lamp to clip into.
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So you will need to release the headlining from the top of the B post in order to find the wires.
This will be on the left hand side of the car
Then a hole will need to be made to post the wires through the headliner.
There will be screw holes in the bracket for the lamp to fix to with self tapping screws
Cheers
Ben
Edited by Ben_O, 18 March 2022 - 09:44 PM.