THIS OIL CAP KIT FITS ON AL-KO & HAYES 10,000 LB - 16,000 LB AXLES. THE DEXTER PART # K71-859-00 CROSSES WITH THE AL-KO PART # K568220. THIS KIT INCLUDES: (1) 021-217-01 OIL CAP, (1) 010-045-00 O-RING, (1) 085-017-00 RUBBER PLUG. THIS IS A GENUINE REPLACEMENT PART!