Eibach ERS Linear Main SpringBrand Eibach Part Number 1600. 300. 0650S Category Suspension Coilover Springs Condition Brand New Original Manufacturer Packaging Eibach's ERS line has evolved over the years to be the world's most prominent, comprehensive and superior Race Spring System. Eibach Race Springs are all manufactured in series production, often repeated, with a strong manufacturing experience. Thus, Eibach constantly achieves the most linear spring characteristic (rate)