Suzuki Motorcycle LT-A500F Vinson 500 4x4 Auto Brake Bulb Size

The Suzuki Motorcycle LT-A500F Vinson 500 4x4 Auto brake light utilizes a P21/5W bulb size for illumination. Data for the specific component covers the range from 2002 to 2007.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2002-2007	P21/5W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W

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Additional Notes

The P21/5W is the sole brake bulb type specified for the Suzuki Motorcycle LT-A500F Vinson 500 4x4 Auto across the 2002-2007 model years.
The P21/5W is a dual-filament bulb, meaning it contains two separate filaments within a single glass envelope. The higher 21W filament serves the brake or stop function, while the lower 5W filament handles a secondary role such as tail or running light operation.
The bulb operates on a 12V electrical system, which is standard for this class of vehicle application.
The P21/5W uses a BAY15d bayonet base. The BAY15d designation indicates an offset pin configuration, where the two pins are positioned at different heights around the base. This asymmetric design prevents incorrect insertion of the bulb into the socket.
The P21/5W conforms to ECE (Economic Commission for Europe) standards, a regulatory framework recognized across Europe and numerous other markets worldwide.
Because the BAY15d base uses offset pins specifically to prevent misalignment, substituting a single-filament bulb or a bulb with a symmetrical base such as the BA15d would result in either fitment failure or incorrect electrical function.
The consistent specification of P21/5W across all six model years indicates no revision to the brake lighting hardware occurred within the 2002-2007 production run of this vehicle.