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As far as I know,Auto steering system includes the following parts: steering wheel, ball joint, Steering Shaft (http://www.gasgoo.com/auto-products/steering-shaft-steering-column-502/),Alternator (http://www.gasgoo.com/auto-products/steering-shaft-steering-column-502/),Steering Column (http://www.gasgoo.com/auto-products/alternator-starter-340/),etc. Above is my understanding of auto systems especially the steering system. If anyone know more, hoping to interact about, Thanks!