| Mono unit and lights
Depends on how elegant or permanent you want it but.....
I have a fibre glass mono unit that I just bought and use for Track days. The lights go in to ride to the track.
This solution may not be the most elegant solution but it works.
Super glue small stips of velcro or double sided tape to the flat facing lip around each light. If using velcro then obviously do the same to the inside of the mono unit around the lights with the other half of the velcro. 8 strips.
Add thin rubber strips/tape to the bung that fits into the mono unit bottom lip under the light unit until the actual lights butt tight up againt the top of the square holes within the mono unit. This is actually enough to hold the whole unit up it but the double sided tape/ velco secures the fit. When in, tape the wire to the inside of the mono unit to stop it pulling down on the unit. | 
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