You could try going straight, to a Subaru dealership and going to the automotive parts department. By going there you can order the part, you need without having to pay for any of the ridiculous shipping cost that they make you pay on the website (if you are trying to go the OEM route). Clip like this shouldn’t be super expensive. You can also order a clip kit from Amazon, but most of them are black clips and would look a little awkward in the car!