Fixing a gap down the side of Victorian fireplace

[DanielWestern]

Hi all,

I am looking at cleaning up and refurbing a Victorian fireplace in my house. It's in pretty good condition, but one problem is that down each side of it there is a missing section, so there is a big vertical gap. See pictures attached to see what I mean. What would be the best way to fix this? I thought maybe a simple solution would be some expanding foam followed by some filler - I am going to paint some sections of it black anyway - but any other suggestions?

Daniel

 

[jj4091]

https://www.etsy.com/uk/market/fireplace_trim?ref=pagination

 

[morqthana]

LED strip?

A wood fillet painted to match?

Are the gaps uniform in width? The same each side?