You can drill them out and replace but would have to make your own. For the amount of effort it needs just buy new ones.
 
I've just changed my rusty old ones for shiny stainless. OK, from Britpart, but seem reasonable quality if a little roughly finished. They don't rattle, anyway. Took the opportunity to spray the inside of the pillars with wax- can't hurt, can it?
This seemed the best option after spending hours trying to refurb the old ones. Waste of time.
 

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