do you have air suspension? If you can't ID the shocks by looking at them open the access panel on the left of the luggage compartment in the rear and see if you have an "Air suspension off" rocker switch. If you only see the red button thats the fuel pump cut off and there will be the air ride rocker switch above that. Most likely you have air suspension and you need an air strut, or cheaper to convert the vehicle to coil spring suspension, the parts are about $335 for all 4.