I am nearly done with the suspension overhaul on my HHR, and have some leftover parts I'd be willing to sell on the cheap.
First up, my original FE3 springs for all four corners are available after replacing with H&R Sport Springs. These have 118k miles on them, but still have plenty of life left. I switched them out because the FE3 ride was softer and higher than I'd like for my more aggressive driving, and the H&R/KYB combo didn't drop me so low or stiffen up too much as to make daily/winter driving painful.
Asking $75 shipped/pp'd OBO for all four FE3 springs.
HHR FE3 Front/Rear Springs, (fronts are still mounted on FE3 struts, struts have less than 20k on them)