Spacer, bushing or what..do they sel them?

I found them on my columns too. Never noticed them before.
One has a limb broken and gone so I figure I would break them all trying to remove them. If not, you could break them at install.
There are more critical small pieces to worry about that also are not reproduced. First best example that comes to mind is the little lever glides in 68 to 72 climate controllers.
In that case of need you'll hope to buy a used climate controller with less wear.
Good luck