You searched for "parallel kit"
INA
INA 10 Tooth Parallel Sprocket, KSR20-B0-16-10-10-15
Part: KSR20-B0-16-10-10-15
10-tooth steel sprocket with parallel bore for compact chain drive systems.
INA
INA 12 Tooth Parallel Sprocket, KSR20-L0-16-10-12-15
Part: KSR20-L0-16-10-12-15
Steel sprocket with 12 teeth for industrial chain drive systems and machinery.