FRAME CONNECTORs FOR 66 Barracuda - HELP
If I'm not mistaken yours are like the Valiants and are the short ones, the Darts are the 111" wheel base. I used these on my car and had to do vary little trimming on the box (shovel as you called it) on the end.
MOPAR - "A" body - 108" wheel base
$124.95
MOPP4286868
Mancini Racing