Need discontinued starter part

I am rebuilding my starter motor and found that I have a part that is needing replacement.  If you have extra starter motors, especially ones that are for known not working or in sad shape, would you consider spending a few minutes to look at grabbing this for me?

Number 7 in this diagram: 

If you don't know about this resource, check it out.  It is very nice to have this information online.

Here is mine - it is missing one of the three tabs that it is supposed to have:

To get to this part, the starter has to be disassembled enough to pull the armature out. 

That is the only part I need.  I have a couple of old Datsun 510 starters that appear to have the same part, but both are functional.  So, before I make one non-functional, I am checking to see if anyone can help.

Thanks for looking.