67 barracuda parts

Fusible link is a generic part, should be available new. It's basically a piece of wire —not much of a surprise.
Windshield glass is available new; any auto glass shop could supply it. Expensive to ship — it would make more sense to have the installing shop order it.
Driver door glass could be found in the "for sale" section. Note that there are 3 different types, for fastback, notchback and convertible body styles.
Headlight bezels would have to be a used or restored part — see the For Sale section.
Under hood wiring harness could be ordered new. See the Vendor section.
"Trunk side panels" probably means the interior side panels in the cargo area of the fastback? See For Sale section. Not commonly available.
Radio is specific for 1967. See For Sale section.
Patch panels are made by AMD or Goodmark, but you need to specify which panels you need.
New dash pad, seat covers and door panels are available from several vendors. Try Year One, Layson's and Legendary Auto Interiors.
Good luck. Here's a suggestion: you could give him a gift certificate to one of the big vendors and let him pick out his own interior parts. They are expensive and often not returnable.