OEM Mahle Piston Ring Set fit Partner & Husqvarna K750 575 cut off (51MM) Rings OEM BRAND NEW PISTON RING SET Manufactured by MAHLE - MAW (GERMANY) ?Replace HUSQVARNA Part Number: #503 28 90-47 ?Piston Ring Diameter: (51MM), Thickness (1.2MM) ?This kit consists of 2 (TWO) PCS of Piston rings Fits HUSQVARNA PARTNER K750 Cut Off Saw, 575 Chainsaw (51MM) MODEL Piston Ring Diameter: (51MM), Thickness (1.2MM). This kit consists of 2 (TWO) PCS of Piston rings