The selected item is a generator alternator stator and rotor assembly (compatible with air-cooled diesel engines like the 186FA seen on the box behind it).Component Type: Alternator Stator and Rotor/Coil AssemblyApplication: Portable diesel or gasoline generators (commonly paired with 186F/186FA 9–10 HP diesel engines)Design Features: Copper-wound stator coils with an outer steel lamination housing and an integrated cooling fan base