Somehow I ended up with 3 of those non-AC brackets. I have one going into my '91 Dakota on the 5.9 I am swapping in, and I am holding on to one for my Duster in case I needed it if the G3 swap goes away for some reason. Best I can tell, I only have the third because I didn't realize I had all I needed and grabbed another at some point.
The Dakota is a non-AC 318 TBI truck and might even have the same bracket, which would mean I have 2 spares.