I finally mounted my fiberglass bumpers and wanted something smoother than the stock license plate lights. I ordered a pair of Micro Star LED lights, and I think it turned out well. So, if you ever mount a fiberglass bumper and need to mount lights, you might check these out. I have no affiliation to these guys, just like how they worked.

http://www.microstarlight.com/micro-startrade-led-light-0

The center is the m6 nutserts for the license plate mount. The leds in the top go through a 1/4" hole and fit nearly flush.

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And finally , lit up. I should have put a fake plate on for the photo, but you get the idea.
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Cool!

Nice. I need lic plate light on my "please don't bump me" fiberglass bumpers.

I have had luck with led's at www.superbrightleds.com.

Matt