Eibach spring kit : Pro-Kit BMW Z4 Roadster (E85)
https://www.rtec.ws/shop/e10-20-010-04-22-eibach-spring-kit-pro-kit-bmw-z4-roadster-e85-26198
https://www.rtec.ws/web/image/product.template/26198/image_1920?unique=b14bd7a
Reference :
E10-20-010-04-22