U Bolt Leaf Spring Plate Slider D Block 03.221.89.05.0 (BPW Trailer) Heavy-duty U bolt leaf spring plate slider D block, cross-reference OEM 0322189050 / 0222188050, part number 03.221.89.05.0, engineered as a direct bolt-on replacement for BPW trailer suspension systems. Mounted beneath the spring stack, the slider block allows controlled fore-aft movement of the leaf spring while the U bolts clamp the assembly, reducing inter-leaf friction and extending spring life. Cast from QT450 ductile iron, the slider delivers high tensile strength and excellent wear resistance under heavy trailer loads. Precision-machined contact surfaces guarantee accurate fitment with no modification required. Surface treated for corrosion resistance and backed by 12-month warranty. Ideal for trailer fleet maintenance and heavy-duty transport operations. Specification Name U Bolt Leaf Spring Plate Slider D Block OE NO. 0322189050 / 0222188050 Part No. 03.221.89.05.0 Type Leaf Spring Material QT450 Warranty 12 Months Application BPW Trailer Place of Origin Fujian, China Why choose VICTORY MACHINERY Fujian Victory Machinery Co., Ltd. is a professional truck parts manufacturer and exporter in China, specializing in leaf spring accessories, suspension, steering and chassis parts for European and Japanese heavy trucks. Factory-direct price, strict quality control, OEM/ODM customization supported. 24/7 service, fast delivery worldwide.