Hi Bret,
this bearing is definitely not replaceable with actual used parts:
Nowadays are the standard type 6001RS (28x12x8) installed.
Another 3 version bearing was already posted here
Changing wheel cartridge bearings
interesting that the given size is different to your results (?).
Yes and no…please be careful!
If you want to use these narrower bearings note that you also must use a longer bearing spacer to balance the missing two millimeters!!
Please refer to part nr. 337 of the drawing or page 25 of the strida 3 manual.
Don’t even think of skipping this tube…
(As this is just an aluminium tube of certain size it should not be a big problem to create a clone which is exactly 2 mm longer.)
Hopefully you’re familiar with bearing extractor tools and their handling 