SP AC-4 assembly.
Marker lights.
The holes that I drilled are very small and will only take the thin wires so the LED's are, first, mounted into the marker lights. Some Kristal Klear used to hold them in place. The wires will, then, be cut and routed to the bottom of the cab. Prior to installation, I painted the green/red lead wires black. The LED's are so small, I keep them lighted during the install to insure proper placement.