duct

I have a heater duct (ac delete) with brackets and screws for a 60 series. $60 plus shipping.

From what I saw on SOR, the side ducts were an option from 8/76 to 10/84. Was this a dealership installed option or did you have to order from the factory? I'm guessing the holes were made at the factory prior to painting. I like the idea of the side vents but hate the idea of cut my dash to...