I am doing a 69 Z right now that I did the dimples in the trunk. reproduction pans don't have the dimples. I used the original pan as a template and made a punch to replicate the dimples. they have to be punched from the bottom. I drilled small holes in the original trunk piece at each dimple. placed it over the new pan and punched a small dimple from the top in the new pan. that would let me identify the exact location of each dimple from the opposite side(bottom underneath car). 2 man job to do dimples. I made a piece of wood with a recess to be placed on the new trunk pan over each location for the dimples and used the punch I made to replicate the dimples by striking from the bottom. lot of work and time consuming, but I got it done.
