Wow, Tony-I have a NOS pair of 64-66 painted front guards I put on old black truck. The original instruction sheet shows using the OE bumper holes. Even says to discard the OE bumper bolts. Guess GM(or their supplier) must have changed their mind somewhere along the line. When I was at the Ford dealer one guy would put bumper guards way out near the edge of the bumper. The OE instructions show them being mounted near the center, but they would fit anywhere. Brian