Interior ceiling lamp help

just bought a micra k12 and the interior courtesy lamp is lose in the roof

Have removed the lamp unit and the 2 metal clips are OK on back of unit

I have felt inside the roof where the clips fit. Is there something supposed to be there for the clips to press against to hold the lamp secure

If I put the lamp back the spring clips aren't pressing against anything and the unit is lose in its housing and moves up and down

Any ideas, thanks
 
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