I'd definitely opt for those long slivers/wedges over some kind of filler
That's what I was thinking, any recommendations on what to buy?
Ideally, you'd use wood as similar as possible to what's there already. Which would seem difficult when ordering online. I've never bought any, and would probably opt for doing them myself on a tablesaw. Not much help, sorry.
@Nef started
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That's what I was thinking, any recommendations on what to buy?