I know this is an older post - but did you ever get a cover and foam cushion for your seat?
A while back I got a gray/pewter leather cover for my 2006 SS - from a place here in Houston, but they list their items on ebay. About half the price of the Seat Shop but the quality seems to be very good. U.S. Auto Seatcover is where mine came from, just got the lower cover for the driver seat - was about $100.
Looking back on it I should've got the foam cushion and the heating element as well, because once I got it apart, the cushion I thought was OK was showing wear at the edge, and the heating element has some burnt spots that explain why it quit working a while back. At least now I know the routine so I can pull the cover back off and do the other work, and re-install the cover. Not a bad job at all, about 1.5 hrs total including pulling it out of the truck, vacuuming the floor while I had the seat out, and re-install.
A few pointers..
1. Believe them when they warn you the seat frame sheetmetal is SHARP. Those pieces are stamped out and not cleaned up at all. If you're not very careful, you'll be bleeding.
2. Don't sweat trying to line up that center seam. The factory didn't, either. I thought I was nuts until I went back and looked at the "before" pic and realized it was off-center, too.
3. If you have power seats, be careful how large you cut the hole for the controls. The factory cover has a stiffening plastic rib sewn into it at the edge of the cutout, that the replacement cover won't have. If you cut the hole the same size, it'll pop out from the control panel as there's nothing to retain it. I ended up cutting the rib off the old cover and gluing it in place on the inside of the old cover; worked great, but it was a mistake I'd try to avoid if I had to do it again.
Obviously you can tell the new vs. old leather, but once it's been in service a few months, the sheen and crackling effect match the existing part very well. BTW the covers from these folks are all leather, not leather w/vinyl sides as the originals were.
Richard