PISTON RING SET (STD - DIAMETER: 107.95 mm) : LISTER / HR-4 / HRA-4 / HRW-4 / HRS-4 / HR-6 / HRA-6 / HRW-6 / HRS-6 / REFERENCE NUMBER: 572-50622 REFERENCE NUMBER: 572-50622 / (The reference numbers given on the products are for checking the products.)