I made this to cover the open end of the frame on my '72 CB500K. Fit is a tad loose on purpose. RTV it on, or use some magnets or whatever. The "front" is intentionally oversized to cover the edges and then some, the raised portion fits inside the cut frame. I printed in transparent ABS to use as lenses. Might put some red LEDs in the frame tube tied to the brake light to act as extra brake lights, could also make blinkers out of them, or running light or whatever.