If you contact ARB USA direct they will answer your questions for you. They will want to know what your vehicle is, what you paln on doing with it (aftermarket type stuff that will add weight) etc and then they will give you all the part numbers, quanity of each needed and in what location the springs should go based on the number of the spring.
USA
ARB 4x4 Accessories
20 South Spokane Street
Seattle WA 98134
Tel: (206) 264 1669
Fax: (206) 264 1670
http://www.arbusa.com/
USA
ARB 4x4 Accessories
20 South Spokane Street
Seattle WA 98134
Tel: (206) 264 1669
Fax: (206) 264 1670
http://www.arbusa.com/