You should be able to source the bearings locally with the number off the originals. Rear side bearings are 60/22. Front side are 6004. Seals will probably be an issue.
You could contact Derek Tissinger. He has a ton of OE parts. I'm sure he'll have the seals and can probably ship them out to you. Call or text him at 661-747-5796. I've sourced many parts for my 350 from him. Good guy.
Here's the link to the part numbers if you need it...
https://www.partzilla.com/catalog/honda/atv/1989/fl400r-a-pilot/front-wheel