Congratulations!

Thanks for being the Pathfinder on this!

[So, the Brushes and Holders and Springs are in the Bottom (White) cap.]

If the ID and OD measurements of the Rotor and the Permanent Magnet
holders inside the Metal Motor Casing are the same...

You could, conceivably, when your Brushes and Commutator wear out
replace them with the Innards of the $58.00 unit.

Mayhaps the Rotor is the same also.

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'84 300SD sold
124.128