parent_part
 
part
 
instance
 
part-tag-2 (Axle)
 
wheel
 
instance-tag-1 (for left wheel)
 
part-tag-2 (Axle)
 
wheel
 
instance-tag-2 (for right wheel)
 
part-tag-3 (Auto)
 
axle
 
instance-tag-3 (for front axle)
 
part-tag-3 (Auto)
 
axle
 
instance-tag-4 (for rear axle)