Adding AC to Duster

yep, The dealer installed air package was a under dash unit some call a knee knocker.
Its vent looked like factory air at first glance. Main difference was the controls placed in the voids between those vents.
The install didn't require changing the factory heat only plenum, firewall, etc...
There isn't so much difference that the standard firewall cannot be modified to accept the a/c but... the impressions outward and inward, and hole differences, make it a challenge.