Just a heads up for anyone in the future planning to replace the wheel bearings on a 1977 Columbia Sachs 505, the wheel bearings for the wheels state they are "6202-2RS" on the seal, which is correct, but on my moped the inner race also had an extra bit of information that was faced inwards (into the wheel) that I could not see- a 1/2" designation for the shaft diameter going through it.
A standard 6202-2RS bearing has an ID/OD/Width of
15mm / 35mm / 11mm
The bearing the Columbia takes is actually a 6202-1/2"-2RS which as the following dimensions
1/2" / 35mm / 11mm.
Picture for proof here
You need the 6202-1/2"-2RS, otherwise your wheel is going to wobble around unrestrained. Thank goodness I double checked the bearings otherwise that would've been a hassle to undo. Oh well, project delayed another 3 days. The usual. (edited)