For the sidemarkers on the rear, I'd think it'd be pretty unique if you did the Firebird marker lights. I say keep the rear red one on the stepside fender, add an amber one one on the front of it, and lose the red one on the fleetside fender. All painted to match the body color of course. Just an idea.
http://67-72chevytrucks.com/vboard/s...light=firebird