Welcome to Harbor Models Inc.
Red Side Lamp
Back is round, not flat
1 or 10/Pack
Please choose your diameter from the drop down menu.
The 4mm size does come with a red LED that can be powered with 6-12 volts.
Includes resistor for scale luminosity in 12 volt systems (to install the resistor, solder it into the positive side of the light as shown here
) . The other sizes do not include bulbs but can be fitted with a clear bulb found here:
Here are the dimensions for the four available sizes, the "r" dimension is the bulb insert through the base of the fixture.