Freightliner Cascadia Trucker Steel Mirror Mount Antenna for CB, XM, TV, Sirius Drivers side is Left. Supports Up to 5' + Antennas Better Grounded Mirror Mount than aluminum. 2.5 times stronger than Aluminum types. Won't break or crack like Aluminum types coated Steel Mounting Bolts. Grounded Mirror Mount Compatible with: CB Antennas, Ham Antennas, Scanner Antennas, AM/FM Antennas. Made in Canada. Install On Driver or Passenger Side Mirror Arms, But we suggest buying a right and left so they match antenna height on both sides.