1990 FXSTS tank panel hardware missing

[Great-Kazoo]

Looking at it again, there is no where for a pin to even attach. I am missing a mount that supposed to attach to the black bolt holes down from the tank bolts too I think.

Those brackets ate the tank mounts, nothing else attaches to them

no, you're not. Those 2 slots are held in place by a spring. Or use to be. There's no bolt, or you'd have a hole in the panel for it.
I believe an upgrade / updated part did have a hole for (iirc) a 1/2" 1/4-20

Also double sides sticky foam was used to keep it from rattling.