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Originally Posted by b13tim
well there the springs sold by GC with the threaded collars spring rates of 300/325 i think ill get pics tonight
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Thats what I figured. The use of "Prokits" in the title is confusing. Prokits are lowering springs designed for oem struts with out the use of the threaded collars. You have what are called ERS spring. 2.5ID I would assume if you got them with the collars and all from Ground Control.