shock plate pads?

Those are isolater leaf spring pad's....... and they came on 73-74 B, and C-body car's. I have never seen them on the a-body car's of those year's. That 73-74 B and C body style had the two brackets with stud's that sqeezed the two pad's together to your leaf spring. You can update your housing to the earlier 72 and back style of u-bolt's, pads and regular shock plate's, but would require fab work too. Just my 2 cent's. Good luck.