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@790
most old cup and cone front hubs take ten 3/16" size bearings on each side.
I get my bearings from https://simplybearings.co.uk, and use the loose Grade 10 Hardened AISI 52100 Chrome Steel Ball Bearings for repacking my hubs.
There's info on the site regarding bearing grades - roundness, hardness corossion ressistance and magnetism - under "loose ball dearings" link > "ball grades" tab. So you can make a decision on what you need if you want to choose a different type to the ones I use.