I found one of my front springs broken yesterday. Z3 3.0 sport and I understand replacements are no longer available for sport springs. After digging around on here and bimmer forums. I found the overall length for the stock sport spring is 330mm but can't find a reliable spring rate or suggested stock alternative. So will any 330 mm spring do such as this https://www.bestpartstore.co.uk/7431489-eibach-coil-spring or can anyone recommend anything as close as possible? Or will stock non sport springs be the way to go?