I have a 2012 GMC Yukon Denali with the (Z55),(6YA),(7YA) in the glove box I need to know the part numbers for AC DELCO front and rear shocks/struts I got part numbers from the GMC dealership but I'm not sure about cross referencing the part numbers? The numbers they gave me are19420493 for the front and19368461 for the rear. Please help? I already ordered the wrong rear shocks once...