Shop our range of 581 BAU15S offset-pin bulbs, including standard filament replacements and upgraded LED options.
BAU15S identifies a single-contact bayonet base with offset locating pins. Standard amber bulbs using this fitting are commonly identified as 581 or PY21W and are primarily used for indicators and other amber signal-light applications. Other BAU15S colours may be used for different compatible lighting functions.
Before ordering, check the pin arrangement, required colour and reference printed on your existing bulb or in the vehicle owner’s manual. BAU15S offset-pin bulbs are not interchangeable with P21W BA15S bulbs with parallel pins.
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