Diamond Reo C116 License Plate Bulb Size

The Diamond Reo C116 license plate light requires a 198 bulb size for proper installation and function. Data for the specified lighting component covers the range from 1990 to 1993.

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 Size
1990-1993	198

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	198

Other Locations

Additional Notes

The Diamond Reo C116 uses the 198 bulb for its license plate position across the 1990-1993 model years.
The 198 bulb follows the ANSI standard, meaning it conforms to specifications recognized across the United States and Canada.
It is classified as a miniature wedge type, which refers to a base design where the glass envelope itself is pinched into a wedge shape and inserted directly into a socket without a separate metal base.
The T5 designation describes the tubular envelope shape, with the numeral indicating a width of 5/8 of an inch.
The 198 bulb operates at 12 volts, consistent with the standard electrical system voltage found in most commercial vehicles.
At a rated output of 2 watts, the 198 is a low-power bulb suited to illumination tasks that require minimal current draw, such as license plate lighting.
The wedge base format of the 198 means it is retained by socket tension alone, with no locking tabs or bayonet pins involved in the fitment.