just to add ... I found where I had saved that pic from - PureFJCruiser.
and they do have a 1 3/4" listed.
unfortunately, no international shipping, but big $ anyway before shipping.
Warrior Products Universal Auxiliary Light Tab Brackets Fits 1 3/4 Round Tubing [59005] - $68.99 : Pure FJ Cruiser, Parts and Accessories for your Toyota FJ Cruiser

 

Look around locally for clamps that fit that diameter pipe.

Stage crews use a lot of clamps that size. Also construction scaffolding.
Note that you can use a larger size clamp and shim it down using strips of rubber (helps protect the paint, too).

 

I bought these from Amazon:
Nilight LED Light Bar Mounting... Nilight LED Light Bar Mounting Bracket Kit LED Off-Road Light Horizontal Bar Tube Clamp Roof Roll Cage Holder,2 Years Warranty, Light Bars - Amazon

 

Did you mean to post pics of what appears to be jugs of ATF along with your light bar selection?

 

No, the stupid Fora app loaded them, I want them deleted but I can’t delete them. Only the last two were supposed to post🤬

 

Thank-you to the mods!

 

That's why I'm not using the Fora app. Fora stinks.

 

thanks everyone. Yes, shimming out oversized ones is probably a good option. Can reduce vibration transfer as well.
of course, no sooner had I asked then things you maybe be interested in popped up on evilbay:

2X 2"INCH 25-50mm Bullbar Mounting Bracket Clamp For Offroad HID LED Light Bar | eBay

and these rotatable ones:

2pc 360-Degree 1/1.5/1.75/2" ATV UTV Off-Road Light Bar Clamp Mount Bracket Kit | eBay