I'm not sure if you know about this site, or if it's too late. All Balls has a fork conversion site, where you can order the bearing kits that you need for a swap.
https://www.allballsracing.com/index.php/forkconversion
This is what I found, for the YZF750 front end.
Yamaha YZF750 1994 25 48 13 99-3509-5 30 52 16 99-3521-5