There have never been parts available for blower motors, so you have to do a little creative fabricating.

For brush holders, suggest you visit your local electric motor repair emporium; bet you can find something that works. If you do, please share with the forum. If not, you may have to make 'em from plastic.

For the fan hub, the fan is a press fit on the motor shaft. Early fans had metal hubs, later ones, plastic. What usually happens with the latter ones is the metal blades work loose from the hub. All I can suggest there is epoxy. If you have a loose metal hub, you can always drill and tap the hub for a set screw.

mike
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'69 Nevada sunroof--"Wolfgang"
'73 Sahara sunroof-- "Ludwig"
'87 eta E30 coupe--"Johannes"
+ Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette)...
and Kermit, the Bugeye Sprite