This is the Fortin ALU Universal Transponder Antenna Loop.
Where the fixed-diameter rings won't fit, the ALU will. It's a universal loop rather than a moulded ring, so it adapts to ignition barrels and housings that fall outside the standard 35, 38 and 41mm sizes, or where there simply isn't a clean cylinder to slide a ring over.
What does an antenna ring do?
Some immobilizer bypass methods work by reading the chip in a spare key held inside a transponder box. For the vehicle to see that signal, an antenna has to sit around the ignition barrel where the factory antenna normally reads your key. This is that antenna.
Fixed-size alternatives
AR35 — 35mm (1-3/8 in.)
AR38 — 38mm (1.5 in.)
AR41 — 41mm (1-5/8 in.)
Not sure what your install needs? Call us on 647-439-4485.