Dusty,
If you (or anyone else) want to save $8, I have an extra conversion cable needed to plug the rear spkrs into the 6x40 amp. I bought one from Harvey couple of wks ago and then found my OEM kit came with one (when I installed last yr I didn't know what it was for). I'll sell my extra for $10. It is for a HAES, non-DSP amp. Be sure you know which amp you need. There are three: HAES, HAES w/DSP, and BOSE.
Also, when you are looking at fleabay you will see LA Dismantlers list several 996 6x40 amps. They have a Buy It Now Price and a Make Offer button. Let me save you some time. They will reject any offer unless it matches the BIN price. What a joke.
Terry