"Only with a stereo AM/FM radio or an 8 track player. You could get one "auxilliary speaker with RPO U80 on a mono radio."
Mark, thanks:
It looks like I have U69, since I have the floor console (D55), so the U79 was not avail. w/ this option, hence you mentioned the U80 option. I saw a wire that looked like it may have been speaker wire cut coming up from passenger side in the trunk by wheel well. To be stock, it would be a single 6X9 speaker for the U80? I guess I should look in my books to see location for the convertible and the bracket, etc. to mount it on.