Thanks for that pic. I had noticed the 99's are different from the 00+. Looks like I don't need to worry about making something to mount the tail light, just need something to extend down for the plate.
Where are your signals? are they integrated?
I was thinking I would have flaps on the side of the plate that could hold the blinkers, which will be aftermarket and much smaller.
Yep, I'm running a LED tail with integrated signals. Not sure what kind of look you are going for, but you could integrate signal mounts into the plate bracket pretty easily. Leave 2 "tabs" to bend out on the sides when you cut out the plate bracket with holes drilled for mounting the signals.
I just did my bends in a vice.