On the motherboard, pin 8 is the blank (vs. 7 on the connector). It's an opposite/swap. Currently, my HAF case connector is there- so it's not a deal-breaker to NOT use the jacks on this new dashboard-- just irritating. I'll be installing the dash & cannot use the fan controls, CPU temp gage, & now headset/mic...I'll basically be getting USB3 (& losing the USB2 front on the case when I do because I'm short USB headers) & possibly the card reader (assuming it's not cobbled to read >2GB).
Understandable frustration. I gave up on card readers because you generally don't know what they support until after you try them. As for the audio plug, if you're patient you can actually pop the little terminals out of the plastic plug end, and essentially rearrange them yourself, but I would try my best to trace them to your "dashboard" to determine just what you're putting where. It should be possible to get a pin-out for your motherboard. Likely if it's not too old, (HD / Azalia Audio was defined around '04), you will have the HD Audio pin header on your motherboard.
There is good information here, along with the pin assignments for both AC'97 and HD Audio:
Yeah, I know. I'm not going to bother to rearrange the wiring. I've done this other times when there was no option- but I think I'll just lick my wounds over a cheap, overseas purchase (my doing- lol) & make do with what I originally wanted- a cheap-ish way to get USB3 to the front panel. Australia is shocking to get even the cheapest parts at a decent cost.
All of this because I want USB3 more accessible & my MB only has 2 at the back. However, I will find it handy to have the SATA to the front, as well. Not sure if it's worth doing the fans or not...but might do, just because I can't use the audio- lol.
You're welcome. Another route might be tracking down an AC'97 to HD Audio adapter cable. I did a quick search, and they do exist, but seems like an older item that isn't stocked so much anymore. Good luck with your project. Sorry about the troubles getting decent computer equipment where you live.