<p style=”text-align: left;”>If bendi. Housing diameter and postion of holf match up with your 6V unit and Bendix teeth are also same, suggest initial bench test to see if 6V or 12V.</p>
Assuming all matches and it runs on appropriate Voltage, try it in an engine.
Even if it fits and works, value will still depend on condition of brushes, commutator, etc.