I dug through the Mopar Parts Catalog for 67-69 for this info. You can do the same for your year. It takes time but you get a really good understanding for the parts and how to use the parts book.
give a man a fish.....
mymopar.com
67
2D Post or 4D ----------------------2663 138
2D Ht., 2D Notch, 2D Fastback---2663 139
Convert ------------------------------2782 029
68-69
2D Post or 4D ------------------------2861 408
2D Ht., 2D Notch, 2D Fast back ---2861 409
Convert --------------------------------2782 029
21 2D Post
23 2D Hard top (aka notch in Barracuda terms)
27 Convertible
29 2D HT. Fast back
41 4D