Denso may supply OE radiators for other Toyota models, or it might be like the (car) batteries that US Toyota dealers sell, seem to have nothing in common with what is installed at the (Japanese) factory.Never heard of T. Rad. Maybe those came out of factory built cruisers?
One's that I've sold at my work in Toyota have been Denso
Just pulled the original 16 year old one out of my 06 LX. Another one (in 2017) out of my son’s 00 LC.