Check the listing for details. Single Groove Delco Alternator Deep V Belt Pulley 10SI 12SI 15SI 27SI Ford Chevy. Condition: New. Listed at 15.25 USD. * 100% New and High/Premium Quality* Fast shipping from California Overdrive Pulley Increase Amp At Idle 17mmID*67mmOD*10mmBELT*22mmLFor Delco 10DN ER/EF; 10SI, 12SI, 15SI, 27SI/Type 100 SeriesIR/EF; Ford 1G Series ER/EF, 2G Series IR/EF Alternators 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.