I'm tryimg to install the backup lights on my 69 RS/SS. I can't find the hole to route the wire up into the trunk. There's a hole for fuel sending unit and license plate but thats it. It has to be a fairly good size hole or two to fit the plug-in through it. I must not be looking in the right place.

Here ya go BigSky, this is looking down into the trunk adjacent to the brace that the bumper bolts into. Hope this helps.
Good luck and yes the plastic clip just barely goes thrut he hole with a round rubber grommet on the wire to seal it up.
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http://www.brainerd.net/~knudsen/69RS/69backuplight-wirehole.JPG

The ones I seen (not that many) were in between the supports for the bumper brackets.