The stock Arkon brackets break over time and expensive to replace for what they are. Print these in PolyC or Nylon to withstand high car temps in the summer. Or print them in PLA and replace every so often. Fits the below type of mount. 3mf is Qidi Studio and may not open in Cura.

https://www.amazon.com/dp/B00EHQMZ6K?ref=ive_vftp_hero_cx_pfo_vse-cards-ingress0&th=1