There are two types of coils springs that you may find in this category depending on your Year, Make, and Model. Coil-Springs designed to be fitted to a strut or coil-over and standard coil that would you find mostly in the rear solid axle vehicles.If you have the answer to the following question(s) please email them to: info@aftermarketbuildersguide.com – What are the factory coil rates, size, and diameter?