①Fitment: Fits for Most Chevy and Ford Water Pumps, Fits 5/8" & 3/4" Center Shaft on Water Pump.
②Function:These shims are designed to properly align the pulleys so the belts will stay put.Pulley alignment is very important, especially when the engine is run at 6000 RPM (revolutions per minute) and above.
③Reference OEM Number:6129.
④Package List:Two 1/16 Inch Thick+One 1/8 Inch Thick