Ok, I'll try and chime in with my thoughts. Don't quote me, just my opinion here.
It seems to me, if in fact those parts did come from your car, they would be used to make up an optional front spool or one-way diff. I can't tell from the pics but are there any holes drilled on the lip area of the pieces?
Due to its shape it wouldn't appear to work anywhere else on the car. You can take out your front diff and compare the outdrive assembly with the pieces and see if anything matches up.
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