[churchx]

I'd prefer rather for someone to simply make something to enable more secure (but easy to remove) mount mechanism to mount existing side markers.
Way i see it - plastic or metal tab/backing plate that is secured well to bumper, and to which, with single bolt (or maybe thumbscrew) from arch lining side, marker is attached/fixed to. This way it should stay well attached and flush, and a bit more extra hassle with mount only during first mount, when backing plate needs to be bolted on to bumper, but simple/quick unmount on all subsequent mounts/removals (unlike way more bolts to marker itself, as in linked verus video). And all existing side markers could be used without special customizing of them.