Mike,
I pulled both frames and buffed them before replacing cans with "modified" SignalStat (now Trucklite) cans and lenses.
Here are a few pics. A bit more work than the LEDs but you can drill a hole in the back of the can and use the fiber optics as well.
I purchased four lights, 2 clear lenses (for backup), and 12 side marker lights for less than $100 from a local truck supply outlet. (I strongly recommend replacing all lights if you haven't already...I love having everything work when I leave the driveway.)
There's a bit of work involved modifying the fixture, but not too much. It kept the original look, which I prefer.