An automotive fastener for insertion into a slotted aperture is provided with a head, a base with an elongated cross-section sized to fit within the slotted aperture for limiting rotation of the base therein, a first array of fins, and a second array of fins offset axially from the first array of fins. The fins in each array extend along respective peripheral regions of the base. The first region is less than half of the base perimeter and spaced apart and opposed from the second region. A automotive fastener for insertion into a slotted aperture is provided with means for connecting a component to a panel; and means for inserting the fastener into the slotted aperture, the means sized to fit and limit rotation therein. The fastener has first and second retainer means for retaining the fastener in the aperture; the second retainer means offset axially from the first means.