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The Compressor Block Fitting, GM A-6 and R4, Complete Kit is engineered around the manufacturer's application-specific specifications. OEM compressor refrigerant line O-ring adapters. GM A-6 and R4 complete kit. Kit includes GM A-6 and R4 early-style compressor adapter block kit with bolt and O-rings (34108-VUG), GM A-6 and R4 offset flange pad seal washer kit (33602-VUI), GM A-6 and R4 seal washer for non-O-ring compressor (33600-VUI). Will also work with 046440-MTR & 046441-MTQ Direct GM Truck/SUV Replacement Compressors.