AC'97 front panel dongle to IntelHD
Rather than futz around trying to change out the existing front panel AC-97 type audio jacks it may make a lot more sense to get a nice drive tray adapter. These are available in an assortment of styles with various features. Here is a basic one that offers the HD Audio (Azailia compatible) (a.k.a. Intel HD Audio) jacks ready to connect into your motherboard.


http://www.newegg.com/product/product.aspx?Item=N82E16813999355

Here are three others to consider with additional features like memory card readers, eSATA connectors, fan speed controls and Firewire.

http://www.newegg.com/Product/Product.aspx?Item=N82E16811996043

http://www.newegg.com/Product/Product.aspx?Item=N82E16820162023

http://www.newegg.com/Product/Product.aspx?Item=N82E16811996006