I own a '94 9C1 and need new shocks. I'll be changing out the 9C1 springs for Impala springs when the shocks are changed. The NAPA site offers Sensa-Tracs and notes they are not for police cars. Is that because of the 9C1 springs? So, if I switch to Impala springs, will I be able to order those shocks? I'm confused. I want the Sensa-Tracs because I personally like the cushy, floaty feel. Does anyone have the combination Sensa-Tracs/Impala springs on their 9C1? What is the correct part numbers for front and rear Sensa-Tracs for this combination on a 9C1? Thanks.