I figured out the wiring through trial and error. The Clarion sounds great with the new speakers!
I also installed Bluetooth capability so I can make hands-free calling and also control the radio with voice commands that's paired with my iPhone. Now my radio looks totally correct for my 1986 Spider but brought into the 21st century with hidden 2015 technology!
Now I can listen to songs from my iTunes music app, play Pandora, play iHeart Radio or any other sound accessible through a smart phone. Plus I can switch back to traditional FM with a touch of a button.
1986 Spider Veloce