You can see details here:
I am not endorsing this product, I just found what you were requesting and assume it is what you wanted.
There are other vendors and many other methods available.
https://pinside.com/pinball/market/shops/1032-lighted-pinball-mods/02252-the-addams-family-lighted-speaker-kit-for-original-speakers

I believe she's talking about these:
https://pinside.com/pinball/market/shops/1032-lighted-pinball-mods/00933-the-addams-family-taf-colored-led-speaker-panel-ultimate

TBH I've never seen or used one. I'm sure its a quality product. Not a mod I'd be interested in on any game myself though. Seems like just a way to create even more glare on your playfield glass. If you think its a cool mod, then just do it, I don't think you'll end up buying junk, they are a pretty trusted vendor

I have seen these at pinball festivals in the vendor booths.
They look pretty cool and look like very professionally made products, from what I could see.
I did not opt to add this to my machine.
I made an offhand comment to the guy in the booth that they seemed rather expensive.
He mentioned what was required to make them and why they cost that much.
Lazer etching, LEDs, etc, etc...
I just politely declined that product and moved to the next booth.
So there is that...

I've seen one in person and it was pretty cool. Adding a ColorDMD with it looks best...

Looks like shit, good luck im your hunt

LOL, he actually mentioned LEDs, cause we all know how expensive they really are right.

I have one in my HS ll with the lighted speakers and I have a color dmd, it's incredible and I love it.

Well, in his defense, it is like a sheet of LED material behind the metal panel.
And I think there is a controller supplied to change colors and such.
So, it is a little more than just some LEDs.