I found the part number for you and what they are.
AT least not you have the sizes. Enjoy.
3976 3/8 x 5/8 BALL BEARING, unflanged
3977 3/16 x 3/8 BALL BEARING, unflanged
And just think. I Like losi and would help an Associated guy.
Gees.
Just Kidding. I'd help anyone.