Harley-Davidson FXSTC Softail Custom Tail Light Bulb Size

Harley-Davidson FXSTC Softail Custom tail light uses a 198 bulb size for replacement applications. The replacement chart covers 1993 to 1999 production years with corresponding bulb specifications.

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 Type	Shop
1993-1999	198	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	198	Check Price

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Additional Notes

The Harley-Davidson FXSTC Softail Custom uses the 198 bulb for its tail light across the 1993-1999 model years.
The 198 bulb follows the ANSI standard, which is the American National Standards Institute classification system used to define bulb specifications for the US and Canadian markets.
It is a T5 miniature wedge bulb, where T5 refers to a tubular bulb body with a 5/8-inch width, and the wedge base type means the glass envelope itself acts as the retaining mechanism rather than a separate metal base.
The 198 bulb operates at 12 volts and draws 2 watts, placing it among the lower-wattage bulbs used in automotive lighting applications.
The wedge base format of the 198 bulb is not interchangeable with bayonet or screw-base bulb types, even when voltage and wattage ratings are otherwise similar.