Here's what I do.
Nothing.
If they are still in place, Yippee! If they aren't, big whoop.
I can't tell the difference once the truck is back together either way.
That my friends is a classic vintage example of 52Carl! Straight and to the point.

With all of this discussion, I'll have to see if there are any on the '47. I haven't noticed any rattling or collapsed trim. Anybody care to offer up the dimensions of these little gems?