They are the Baja Designs flush mount versions mounted in an angled housing to help compensate the angle of ARB bumper that a friend designed and machined at his manufacturing company.
I run the larger Donaldson cyclonic filter on my 80, started with the smaller version, but didn’t like the “swoosh” noise it created and switched to the larger version. I find it very effective for catching dust before it enters the filter housing,
which I think is the biggest (only?) reason...