Good news, everyone! AMR has new radiators in stock, though if you signed up via their waitlist you probably already got an email.
https://amrengineering.com/product/1...r-w-slim-fans/
Just in time after I sold my SVX. >_<
Prior to that, though, I got lucky searching car-part.com and found a yard that was willing to ship me a radiator out of a SVX in their inventory when I needed one. Good luck!