Hi, from a car I parted out about 15 years ago I saved the brackets that go to the rear guards. They fit in behind the rear steel painted body underneath the bumper and hold the lower part of the guards. They bolt to the frame rail. One bolt per each side. If you want to EM me direct my EM address is:
pserio@columbus.rr.com I have some other parts, they are from a '63 Lemans.