Also look on the firewall, below the master cylinder brackets. All RS models had a factory punched hole approximately 3/4 to 1" diameter where the headlight wires or vacum hoses passed through the firewall. A 67 had a bung with the wires in it, a 68 had a grommet with two holes for the vacum lines. Also the rocker moldings were unique in that they were three piece designs and the center piece was mounted on the door instead of below it. You'll see the large holes if the door panels are removed for the mounting clips, many of these were filled if the car was repainted.