Seat attachment
 

How are the front seat attached to the floorpan on our SS's? I see bolts in the back, but what about the front? I'd like to raise the front or lower the rear to get a bit more thigh support..............

After you take out the two rear bolts, you slide the seat assembly back to unhook the front mounting.

If you find a good(and safe) way to lower the back of the seat,please post it here. I got a junkyard HHR seat bar:it is the bar that stretches from door to door and the back of the seats bolt to.Have not figured out the best way to modify this bar. I would like to drop the rear of the drivers seat 1-2 inches. I know there could be safety issues so I guess thats why I haven't tried anything yet.

https://www.chevyhhr.net/forums/how-tutorial-library-21/seat-removal-carpet-install-13261/

Looks like it might be easier to put spacers under the front rather than trying to lower the rear.

If you have access to a small mig welder, cut the bar at each end, weld a 1 to 2 inch plate onto the bar and re-weld the ends at the top giving you the desired "drop" in the back. If you mess it up, the just yards are full of spares to replace it.

Thanks for the suggestion. The problem is the contour of the floor pan. Looks to me if I cut the bar and drop 1-2 inches,the seat bracket will be right against the edge of the floor pan turn up on the outside edge.No room left to weld a bracket.Don't know if the performance seat bracket I have is wider than the others.
I do have a spare seat bar to experiment with.
Junk yard bar-$20 Dealer price $86