Looking at that pic and I bunch of Jet's, you are right on this. The angle of the speaker goes forward not backward or both ways. That must be an object on the fence of something the tape's poor quality didn't accurately pick up, unless the speaker is mounted backward which I doubt, but it is New Britain which ahs done other weird things. It probably is a blue-blue Edge without a speaker and allys as that's what I recall seeing in the 90s on the aero Caprices and few
CVPI's before going back to red-blue on the newer LT1 '94-'96 Caprices. Do you recall what NB used in the mid to late 80s, did they go straight from Crossbar with senior strobes and red 184 in the center to the red-blue without ally's Edge?