TR0305A is the Koyo with a slightly different bearing angle.
i had a heck of a time finding them most of the time they tried to sell me wheel bearings, they had no listing for steering nuckle bearings
![I Dunno... :dunno:](https://board.marlincrawler.com/Smileys/marlin/dunno.gif)
I have a book that has all the dimensions of pretty much every bearing from each manufacturer. It does help when trying to cross reference by dimension, or when building custom stuff.