I don't know if this helps at all but I saw this on a 2013 video on how to replace the fabric on an A&E topper. The video isn't about how the brackets are installed but you can clearly see that they are mounted on the flange. I don't know what the install would have looked like, only that the methodology for mounting on the flange has been used before.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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