I have looked far and wide for a better-looking and intact replacement, with no luck. The few that have appeared from resellers on eBay and Etsy were snapped up quickly.
If this gizmo sounds like something that would help you from either overcooking or undercooking fish, here's my workaround:
Take a straight-edge metal ruler. Put it next to the piece of fish you will be cooking. Using a non-flexible thin item such as an icing spatula or knife, place it across the fish, perpendicular to the ruler and measure how thick the fish is. Figure 5 minutes of cooking time for every half inch of fish, 10 minutes for 1" and so on. Bake or broil at 450°F ; pan fry or deep fry at 375°F.
It has never let me down. If anyone hears of a reissue of this useful tool, please let me know!