R4 (radial) A/C Compressor Works with All Passenger Side R4 LS Brackets HolleyWorks with all Holley passenger side R4 Ls brackets. Features and Benefits: Works with all Holley passenger side R4 Ls brackets Port for high pressure safety switch 5 inch clutch pulley for safer RPM operation Weatherproof 8 mm pin clutch connector For use with manifold using 5 8 inch x 5 8 inch Sealing Washer design (washers not included) Uses weatherproof plug pigtail P N 199 200 (not included) Associated Comments: These compressors are pre oiled