System Features OEM Style Crankshaft Billet Hard Coated Pulley 4-Groove - 383-440 MoparHard to find OEM-style pulleys to install air conditioning on your classic Mopar engine. Two outer grooves 7" Diameter. Two inner grooves 7-1/2" Diameter" Vehicle Fitment warning California Proposition 65 arrow_drop_down WARNING: California proposition 65