1.Torsion bars rubber core 2.OEM availability, 3.after sale service. 4.quick reply. 5.free sample will be offered Pls don't hesitate to contact us if you have any questions about our products.Your enquiry will be highly apprciated,Inquiries are typically answered within 24 hours. we have all kinds of truck parts,especially for the engine ,both assembly and the parts of it.