Father-Son 1974 Duster Project

View attachment 1714968852 I'm looking for some help with finding a replacement for one of the defroster hoses that the paint shop who did my dash frame misplaced. I have one of them but I'm not sure what side it goes to. Once I figure that out at least I can post to look for a replacement.
Car is a 74 with AC

Autozone. Dorman 96034. HVAC hose