It could be an interesting project for someone.
In March 1913 "The Autocar" magazine printed 13 pages of radiator/bonnet drawings in alphabetical order from "Aberdonia" to "Unic" 12 on each page.
As an example, picking up on the round shape, it shows Bentall, Calthorpe, Coltman, Delaunay-Bellville, Germain, Hotchkiss, Maudslay, Pick, Pilain, Riley, Sheffield-Simplex, and Spyker.
and here's a sample page with a few you'll recognise.