... 2)Type:Conventional,Parabolic,Z-type,Small tariler,Boat trailer,Multi etc 3)Cert:TS16949/ISO 1) Marerial: ... SUP11A;2) Type:Conventional,Parabolic,Z-type,Galvanized,Boat Trailer,Small Trailer,Multi;3) Size: 75X14 other small size & ... leaf spring which are used in heavy duty trucks, semi-trailers, boat trailers, light duty trucks, buses and ... and ISO 9001:2000 system. Leaf spring for semi-trailer 75X14-7