springs suspension

Hi all, i’m looking too lower the rear end of my 2004 vz accliam commdore, im just wondering if these Ultralow Lowered Rear KING Springs to suit Commodore VT VX VY VZ Sedan Models will be okay and if i will need too buy anything extra before getting these installed? It says in the description...

Guys, Was hoping for some advice on suspension for a Chevrolet CR8 (Oct 2008 build) which is the Middle East version of a HSV E1. Just some background on the CR8 - there are some discernable differences to the car as compared to say a E1 Clubsport. Main mechanicals seem to be the same (LS3...