... parts synchronizer ring for ZF gearbox 16S151 16S181 16S221 16S251 Product information:Item Namesynchronizer ring Part No1297304402 Material20CrMnTiApplicable GearboxZF 16S151 16S181 16S221 16S251 transmission ... so on.7 Our main products:Gearbox aseembly, transmission, gear, sliding sleeve, synchronizer hub, synchronizer body, Synchronizer cone, clutch body, Coupling Body, flange, pressure ...