63-66 engine mounts vs 67-up engine mounts

Wow, I didn't know that. What's the difference?

The 65 Dart insulator looks like the leter style, about 3/4 inch of rubber between 2 plates, the "grilled cheese sandwich" look.

DODGE DART (1964 - 1973)
PLYMOUTH BARRACUDA (1968 - 1969)
PLYMOUTH VALIANT (1966 - 1972)

The 65 Barracuda looks like a 3 inch thick brownie originally with an overlapping plate

Check Rockauto under valiant (barracuda is the same but not listed)