So first start by removing stock front struts.
Disassemble them. You'll need a E8 torx socket to take the spring perch apart then there is a 21mm nut holding it to the strut.
Now take the new TC strut and put the plastic spring seat from your old strut in it.
I got the spring compressors free off charge from my local Parts source, just had to pay a deposit that was reimbursed upon return so that was sweet. Slide the old dust shield on.
There is a spacer in the bottom of the spring perch, in order to keep this in place you need to use the stock locknut that was on the original RL struts as the one for the new TC struts is to long. If you don't you'll end up doing it twice like me LOL.
Now take the spring hat from Cobalt front suspension with magic 0TTP shim in place, place plastic strut bearing on top and then RL spring perch on top of that.
Install the top bolt onto the strut and release the spring compressors being mindful of the positioning of the plastic bearing as you don't want to have it out of place and crush it. Also be sure that the tab (green mark) on the spring hat is facing the inside of the car upon assembly.
SS/TC Struts with Pedders
Then just bolt the RL strut cap back on and torque the E8 bolts to 124 inlbs. Mount the assembly back in place and TA-DAH, Pedders on a Redline. 81 ftlbs for the top strut bolt and 89ftlbs for the strut to steering knuckle.