The Polaris FST IQ Cruiser uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 2007 to 2008 vehicle production specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 is a dual-filament halogen bulb operating at 12 volts, with a rated output of 60 watts on the high beam filament and 55 watts on the low beam filament. It uses a P43t base, which is a bayonet-style mount with a 43mm collar.
Because the 9003 contains two filaments within a single bulb, it serves both the high beam and low beam functions from one unit. In the Polaris FST IQ Cruiser (2007-2008), a single 9003 bulb therefore covers both lighting modes per headlight assembly.
The 9003 designation follows the ANSI standard used in the United States and Canada. This classification system defines the bulb's electrical ratings, filament position, and base type to ensure consistent fitment across compliant fixtures.
The P43t base is not universally interchangeable with other common halogen base types such as H4, despite the 9003 and H4 sharing similar electrical ratings. The two standards differ in base construction tolerances, and substitution between them is not guaranteed to produce a secure or correctly aligned fit.
The FST IQ Cruiser uses the same 9003 bulb specification across both model years covered (2007-2008) and across both the high beam and low beam positions, meaning a single bulb type applies to all four of those fitment entries.