I have a 2001 Deville. The rear shocks need replacement. ACDelco have 4 type fit Deville 504-547;504-115;504-116;504-147, I am total confuse except 547 the other looks like same, so any different between them and which should I choose. And I also need to replace the Power Steering Pressure Line Hose, the ACDelco have 2 type fit Deville 36-365407 and 36-365467 which should i choose. Very grateful.:yup: