Lets see your rear defogger/speaker adapter

A little background: I've owned the car since 1986. Bought from a friend who bought it from another friend. The original speakers were toast, so I replaced them in the early 90's, along with the spliced in brown speaker wire. The other two guys never messed with them, as I was with my friend when he bought the car in 1979 and looked it all over, wondering why a Dart Swinger would have A/C and a bunch of other add-ons( MY brother had a swinger that had very few options, but ran really well on Sunoco premium). The car is factory stock with the AM/FM and the Rear Defrost.

So, it is possible that from 1969 to 1979 that someone could have fabbed them up, but I don't have any idea. Just think it is a cool setup, nonetheless.