I'm new to the Forum and could use some help from the group. I have an early (November 67 build) 68 Bronco, original V8 Ranger that I'm installing a Vintage Air Heat, Defrost A/C in. Here's my problem, my 68 has a smaller radiator opening than the 69-77 core support, its 16 3/4" wide by 10 5/8"...