1.5" (1-1/2" or 38mm) Roll Bar Clamps – Offroad Communications
LIZARD GO Tube Clamps - 4Pack,Cross Bar Clamp 1.125",1.25",1.5 inch,Roll Cage Clamp for Bar Diameter 1-1/8", 1-1/4",1-1/2" Mounting Bracket, Motorcycle Crash Bar Led pod Light Mount(28/32/38mm Clamp) - Amazon.com
38MM Outer Diameter Tube Size STAUFF Heavy Series Hydraulic Polypropylene Pipe Clamp, with Galvannized Steel Top Base Plate & Metric Hex Bolts - Amazon.com