DIN rail mounts for ICI T&G 35x7.5mm. Other mounts did not fit these rails as they have funky fins that come out from the right angles of the rail.
Here are the exact rails this will fit - https://www.amazon.com/gp/product/B079TX7WDQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
The author marked this model as their own original creation.