Harley-Davidson FXSTC Softail Custom Brake Bulb Size

Harley-Davidson FXSTC Softail Custom uses a 198 bulb size for brake applications. The replacement chart covers 1993 to 1999 model 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.

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 the brake light position 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 types for the United States and Canadian markets.
This bulb belongs to the T5 form factor, a miniature wedge-base type. The wedge base design means the glass envelope itself acts as the retention mechanism, with no separate metal base or pins required for socket fitment.
The 198 operates at 12 volts and draws 2 watts, placing it at the low end of the power range for automotive signal and indicator applications.
Because the 198 is a wedge-base bulb, substitution with bayonet or screw-base types is not possible without a socket adapter, as the base configurations are physically incompatible.