The bearings are a 8x22x7
You also need 4 new m3 x 20mm screws
UPDATE
Thanks to user suggestions I updated the main body with a longer and thicker arm to reach the center of the spool.
Here a remix of the original AMS Lite Spool holder made by 3Dbacon to fit this version.
https://makerworld.com/en/models/234955#profileId-251291
FUTURE UPDATE
Left hand threads for spindle holders to maintain compatibility with the original project