The cable is on the drivers side. Take off the trim and you will see it easily.

 

Hey "Rocket"...sorry about this, but it turns out I won't be needing the head unit. I found a cheap slave tape drive for my '97 on eBay. I'm just going to hack into the audio channels on that and take my aux9 adapter back to the store. Thanks for all your help!

 

aaaiiiieeeet v8bird