BMW 2001 525i body work

I have a 2001 525i.  There is some damage to
the rear door on the passenger side.  I would
like to replace rather than repair.  My question
is are there differences in the dimensions of
the rear door on the 5 series vs. the 3 series
and 7 series that prevent them to be
interchangeable? Is there some website that
has these measurements?  I am looking for
info prior to starting any work on the vehicle.