Hello, just wanted to share I've uploaded the v2.1 ROMs for the Radius 16/25 accelerator for the SE. I've not found another copy online, so hopefully this helps someone who wants to run Sys 7.1/7.0 on their SE with Radius card.
Link: https://www.macintoshrepository.org/27255-radius-se-accelerator-2-1-roms
Link: https://www.macintoshrepository.org/27255-radius-se-accelerator-2-1-roms