These gears fit The Hyundai Tucson, Kia Sportage, and Kia Optima (2016-2021).
IF you hear a crunching, grinding sound you will need to replace the entire window regulator.
IF you hear nothing or a constant turning sound it should be just the gear/spool/sprocket inside the regulator.
These gears can be returned if in uninstalled condition. If they are chewed up they will not be accepted for refund.
You might notice the gears seem to be opposite spool to the original. Does not matter. They work fine.
2-3 Day Delivery with USPS Priority from Florida.