I used Magnetic mounts for my light bar from amazon:

omotor Powerful Mount Bracket... https://www.amazon.com/dp/B07M63Q851?ref=ppx_pop_mob_ap_share

Lightbar from Amazon too!

40 Inch LED Light Bar, DJI 4X4... https://www.amazon.com/dp/B07QZ224Z6?ref=ppx_pop_mob_ap_share

I ended up wiring the button through the door wiring, and not the firewall because of such a tight squeeze. i’ll send more pics if needed!