Bjorn,
Sounds like he had a column shift car that someone installed a floor shift on. Maybe the column shift handle is still there or has been removed.

Is it automatic or manual , is it a tilt column or not?

I dont have an answer on interchange but you will need to specify these. I also though I read that Camaro was not a direct bolt up. Not sure though.

There are also services that rebuild steering columns. Don't know abou damaged external pieces though. Maybe they can swap the collar for you?