Structural supports.
Vintage
Air is supplying the AC unit and Painless Wiring is handling the wiring requirements.
Not much room under that dash to work with.

Hot Rods & Custom Stuff, 2324 Auto Park Way, Escondido, CA.,
1-800-HOT-ROD-5.
Hot Rods & Custom Stuff - builds, restores, paints, services
and sells parts for classic autos, cars, trucks and street rods.