Kubota RTV-X900 General Purpose Turn Signal Bulb Size

Kubota RTV-X900 General Purpose rear turn signal bulb uses P21W size. The replacement chart covers 2015 to 2018 vehicle production years with bulb specifications.

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

Rear Turn Signal

Years	Bulb Size
2015-2018	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The P21W is the sole bulb type listed for the rear turn signal position on the Kubota RTV-X900 General Purpose across all specified model years, covering 2015-2018.
The P21W operates on a 12-volt electrical system and draws 21 watts, which is the standard power rating for single-filament signalling applications in this bulb family.
The P21W uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin rather than the dual-pin BA15d variant. These two base types are not interchangeable despite their similar appearance.
The P21W is governed by ECE regulations, a standard adopted across Europe and numerous other markets worldwide, meaning the bulb conforms to internationally recognized output and performance criteria.
As a single-filament bulb, the P21W serves one dedicated function per lamp housing. This contrasts with dual-filament types such as the P21/5W, which handles two functions from a single unit. Substituting a dual-filament type in a single-filament application risks incorrect circuit behavior.