I bought mine at Ministry of Pinball in the Netherlands. I got the whole set of insert decals when I pulled off the mylar and redid the playfield. With some Novus I got the playfield looking really nice and shiny, replaced the damaged inserts then put down a proti.
The decals were quite usable, but I cannot say I’m completely satisfied. The faces of the diners are darker than on the original. I suppose they could have faded over time, but they looked like yours. The new ones are fine when you’re playing and the insert lights are on. It’s one big piece with all 5 diners - it fit pretty well.
What didn’t work so well was the decal over the DINER letters. It didn’t cover the inserts entirely so I had to start getting creative. I discovered that the red on a Time Magazine cover matched the red on Diner almost exactly. Also I kind of wish the yellow around the letters was less translucent.
The worst was the decal for the grill area - I wound up not using it at all and making my own.