Check the listing for details. Delco 10SI Alternator Generator Deep V Belt Pulley Chevrolet Tractor 1/2" W. Condition: New. Listed at 14.85 USD. * 100% New and High/Premium Quality* Fast shipping from California Overdrive Pulley Increase Amp At Idle 17mmID*66mmOD*13mmBELT*22mmLFor Delco 10DN ER/EF; 10SI, 12SI, 15SI/Type1 Groove Pulley ID: .67" or 17mmPulley OD: 2.63" or 66.7mmThickness: .931" or 23.64mmKey width: .157" or 4mmBelt Width: .512" or 13mm Returns Policy1.We gladly accept returns for any uninstalled item within 30 days of purchase.2.All return requests must be submitted through your eBay account.3.Buyers pay for return shipping fee.4.Items to be returned must be in original, unused condition (including all packaging, tags and all accessories)5.Full refund are not acceptable for items in compatibility reason (Returns are deduction of the original shipping cost.) **Please Check Your ALTERNATOR Before Ordering To Make Sure This is The Correct Part.**Part is guaranteed to function as designed; it is not guaranteed to fix your problem. Proper diagnosis is required.