These blinkers look great and are nice and bright however they are poor quality. While tightening the bolt to the blinker, the metal threads ripped right out of the blinker. It was barely even hand tight when it broke.
These would not be a direct bolt on for the 2008 Honda Shadow Spirit. The mounting for the stock signals is a different configuration. The rear signals would be easier to install and would require you to enlarge the mounting hole for these to fit. The front would require more work as the stock front signals are integrated into the mounting clamps on the forks. It would require new mounting brackets to get these to fit on the front. These signals will blink amber and do not require different lenses.