These are custom for The 3rd Gen Fit:
Between-the-vent mount:
https://www.amazon.com/dp/B0871Y978V?ref_=cm_sw_r_cp_ud_dp_H586MQV36K7DEM8A332R
It supports a universal 17mm ball-joint mount, so you can replace with any holder of your choice
Driver-side Cup Holder Mount:
https://www.ebay.com/itm/403474880912?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=ratss7oit2i&sssrc=2349624&ssuid=ffeUK80qRRu&var=&widget_ver=artemis&media=COPY
Center Console/Passenger Side Mount:
https://www.proclipusa.com/collections/dashboard-mounts-honda-fit-2016
I used a combonation of these two mounts. The first one clicks right into the dashboard above the radio, but I found the actual phone holder was lacking.
https://www.amazon.com/gp/product/B0871Y978V/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B0875RKTQF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 For this one you might be able to use a magnetic mount, but I know this one for sure is interchangeable with the first.(It uses that ball grip to attach the phone holder.)
LUNQIN Car Phone Holder for Honda... https://www.amazon.com/dp/B0871Y978V?ref=ppx_pop_mob_ap_share
I got this got a new iPhone 12 works great perfect fit in between the vents