Recently mocked up my (4) Hella 500 off road lights. I mounted them using a tube bumper clamp light mount kit but as I suspected, once it got hot, the rubber sleeves would get squishy causing the lights to flop around.
I need to call Yakima to try and get a key for the rack above my front doors. Then I plan to take it off then weld four tabs on for the Hella 500s. I also am going to do better wiring than the lights come with. I'll share what I did when I get to it.
Here it is with the lights on, I think it looks pretty cool and retro. First pic is from my Cruiser Clubs recent tech day.
One of the club members has this rad 70 Series from Japan! So cool!