I thought I'd post the mod I started today. I changed my mirror signal lights to LED's. But I didn't change the bulb to a LED one, I made a custom set of 8 18000mcd 5mm red LED's. I will do a write-up of how I did it once I do the right one.

The first pic is of the rear of the truck for a comparison. The second is of the right mirror signal light (stock), and the last pic is of the left mirror signal light (LED). The pictures do it no justice.