Kubota RTV-X900 Worksite Turn Signal Bulb Size

Additional Notes

• The rear turn signal positions across the Kubota RTV-X900 Worksite model years covered in these specifications use two distinct bulb types: the P21W and the P21/5W, both governed by ECE standards recognized in Europe and worldwide.
• The P21W is a single-filament signalling bulb operating at 12V and 21W, fitted with a BA15s bayonet base. Its single filament means it serves one lighting function only, which in this context is the turn signal.
• The P21/5W is a dual-filament signalling bulb operating at 12V with filaments rated at 21W and 5W respectively, fitted with a BAY15d bayonet base. The dual-filament design allows it to serve two separate lighting functions from a single bulb.
• The BA15s base of the P21W and the BAY15d base of the P21/5W are not interchangeable. The BAY15d base features offset locating pins to prevent incorrect installation, while the BA15s base has symmetrically placed pins.
• For the Kubota RTV-X900 Worksite, the rear turn signal position takes the P21W in the 2015, 2016, and 2018 model years.
• The 2017 model year of the RTV-X900 Worksite rear turn signal position takes the P21/5W rather than the P21W used in the surrounding years.
• Because the 2017 specification calls for a dual-filament P21/5W while adjacent years call for a single-filament P21W, substituting one for the other in a 2017 unit would result in a base mismatch and incorrect fitment.