Booster seat belt positioning clip (Hawthorne/Near east side)

Looking for up to two "belt positioning clips" for Graco TurboBooster toddler car seats. This is the little black strap with a red oval clip on one end and a loop on the other. See picture. If you have one you're no longer using (such as from a car seat you no longer use or an expired car seat you disposed of), I'd love to pick it up anywhere on the east side of Madison and nearby. Thanks for looking.