What PARTS did Hurst and Chrysler put in the Super Stock Barracuda & Dart not in other factory cars

In Bob Tarozzi’s notes from designing the cars, he just lists those parts like they were off the shelf nothing special.

I think the mirror block off has an 25xxxx part number??? So that originates to 1964-1965. The second digit is typically the year it was first used (intended to use).