Hello and good day Johan. Thank you for reaching out and for the inquiry. You may try to check our DJI online store for the DJI Osmo Action mount that you want to purchase. I will be posting a link where in you can check the DJI Osmo Action Adhesive Mount Kit. I hope this can help. Thank you.
Here's another link to many accessories including those mounts posted above. If you are asking about some of the plastic adapters, many GoPro adapters of all kinds fit, too.
You are very much welcome Johan. If you have any other inquiries or concerns with DJI. Please feel free to post it here at DJI Forum. We are all here to help and support you.