I think you must have confused him. The picture you showed above matches the image they show on their website -
View attachment 1715782376
The only other dash and IP I know of is the Rallye dash that came in the 340 cars and all A-Body Barracuda.
It had a much longer IP opening that the one above:
View attachment 1715782377
If you posted your actual IP, then the Classic Industries insert will fit the opening.