So these brackets work brilliantly and fit quite easily along the top of the crash bar.
This is for the 'full size' 2" version if you scroll through the product pics.
These slide apart and are not 'hinged' in the traditional sense.
The center hole accommodates a 3/8" bolt, two allen head bolts to secure the clamp...I think I may add a nut with some loctite to secure once I'm done getting the wiring run and the pods set up.
It does come with two sleeves/shims though they certainly aren't silicone... feels like a thick/flexible plastic.
I'd post pics but the site doesn't support it and I'm not interested in a photo hosting site.
https://tinyurl.com/44bn6932