The Yamaha XVS950 Bolt uses 12496 and 1034NA bulb sizes for front turn signals, while rear turn signals require 12496 or PY21W bulb sizes. The replacement chart covers 2014 through 2020 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1034NA bulb follows the ANSI standard used in the United States and Canada. It is a dual-filament halogen type rated at 12V and 21/5W, fitted with a BAY15d bayonet base, and features natural amber glass rather than a clear envelope.
The PY21W bulb follows the ECE standard common in Europe and worldwide markets. It is a single-filament amber bulb rated at 12V and 21W, using a BAU15s bayonet base.
The BAY15d and BAU15s bayonet bases are not interchangeable. BAY15d has two offset pins at the same rotational angle, while BAU15s has a single pin offset at a different angle, meaning PY21W and 1034NA bulbs cannot substitute for one another despite sharing a similar wattage on their primary filament.
The 1034NA is a variant of the 1157 bulb family. The key distinction is its natural amber glass, which produces an amber output without relying on an amber lens.
The 12496 is a Philips/Osram part number designating a halogen bulb for specialty automotive applications, rated at 12V.
On the Yamaha XVS950 Bolt, the front turn signal used the 1034NA bulb across the 2014-2018 model years, then transitioned to the 12496 for the 2019 model year.
The rear turn signal specification on the same motorcycle shows variation across model years, with the PY21W appearing in 2014 and again in 2016-2018, while the 12496 is specified for 2015, 2019, and 2020.
Because the front and rear positions do not always share the same bulb type within a given model year, the two positions require separate verification before replacement.
The dual-filament design of the 1034NA means it serves both a running light function and a turn signal function through separate filaments within a single bulb, whereas the single-filament PY21W serves only one function per bulb.