Since factory signal mirrors are so hard-to-find, building them is another option. These LED chevrons were made by
Shark Racing (back in 2012, now
from many eBay sellers), and are specifically built for this purpose. They recommend mounting them between the backing plate & the glass. But because it's nearly impossible to separate the mirror from the plate without destroying either of them, and because putting them there doesn't make them directional, I'm putting them on the backs of the plates. First, I powered one and created a paper template by silhouette.
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