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there are 2 OEM crank pullies/harmonic dampeners, the difference being the section for the powersteering belt, 3 rib vs 4 rib there are 2 OEM power steering pullies, hydraulic hicas is a 4 rib, all others are 3 rib. there are also 2 aftermarket power steering pullies made by UR, comes in a 4 rib or 3 rib. Almost all aftermarket crank pullies are setup for the 4 rib belt to make it easier for the manufacturer to just make one pulley as there really is no need for two. You can use a 3 rib belt on a 4 rib pulley just fine
Alex 
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