How do I replace these metal pieces from my instrument panel?

Done.
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Filed the head flat on an escutcheon pin.
Britened the shank with fine emery.
Cleaned the inside of the contact pin with a copper wire strands, deoxit followeed by fast dry electocontact cleaner.
A tiny amount of non-corossive flux in the contact pin.
Partially installed the escutchen pin (with the board gently but firmly held vertical in a vise with felt cloth).
Applied heat to the escutcheun pin and then some solder. Heated the contact pin, then the escutchean pin til the solder flowed again and pushed the pin all the way in while applying the iron to the contact pin.
Hold both pieces in posiution while it cools.
Clean flux residue.

I wouldn't do that with a bunch completely broken when Mike has the offer to replace with new. But for just one, and this one was still attached, was a reasonable way to repair.