My 74 Euro Pantera was delivered from the factory with small chrome bumpers. Later the car was privately imported to the US in the mid 80's and they had to put big bumpers on it to get it into the country. Their bumper conversion pretty much looked like factory work except that the two holes for the small bumper remained. I brought the car back to small chrome bumpers two years ago. Here are a couple of photos that might help with your effort. I had to weld over two small holes along with the large hole for the shock.
