I make everything on classic machines
The bearing EL6 has the same dimensions as the 626Z - 6x19x6 mm.
EL6 is the original SKF marking
https://www.bearing-web.com/en/bearing-EL6-SKF-50906.html
I have used my spare parts.
The work took about 20 days.
Bearings are purchased on Ebay.
Type 626 ZZ
https://www.ebay.com/itm/10Pcs-623zz-624zz-625zz-626zz-688zz-Deep-Groove-Ball-Bearing-Miniature-Bearings/132989602132?hash=item1ef6cc4954:m:mUMQjKCn9v4_r_vzykLNwsg