Gas Tank Straps

There is a part that welds inside the spare well and drops ears through holes in the well. Inside the well it holds the spare wheel anchor. Underneath the well it supports the fuel tank. Shinny black pic doesn't clearly show this part in place. Aftermarket wells don't include it ? I don't know.
By the way, If your car is a pre 68, the correct tank has a single strap routed left to right so the hangers under the well aren't required.