2003 9C1 Impala

I purchased a 03 Impala a while ago. Its a 9C1. Need help!! The vehicle needs struts. My auto parts shop only lists one type. I would believe there would be heavy duty type for my 9C1. Any help would be great. Also my ash tray was damaged , w/ my knee,when i unfastened my seatbelt alittle to early.Brakes work perfect. A little background, I am a full time FF/EMT. Not a police wantabe. She does have most all of the goodies, no push bar yet. Purchased it w/ 64K. Needed very little work,not much. Looks and drives like a true 9C1 . Do i have to go to the dealership or are there any other places for parts? Any help would be great. Thanks.
STAY SAFE
MIKE