I need a bearing ...29mm ext. and 20mm internal diameter

What about looking in imperial instead of metric.might have more luck.

Or put the 28mm in and use a shim
Shim material has been around for a long time,must come in a range of thicknesses :?
 
take it to your local brammer(google them) they should be able to match it up
if there is a code on the bearing then it makes things alot easier
 
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