truck part,leaf spring leaf spring for heavy duty truck, standard leaf spring: Howo system,Styer system, 6X4,6X2,4X2, ... 8X2 and more.our leaf spring use for heavy duty truck, trailer,semi-trailer.Use the raw metal usually: SUP7 ... , it's accept.for our business, please email us about your require and company details.thank you very much. truck part, leaf spring