Photos from other 2002 SERK owners will help put this to bed, but in the mean time we might as well speculate and make wild assumptions about this somewhat irrelevant circumstance.
My sense is that the brandywine ’02 SERK’s were some of the earliest CVO’s made in ’02. When Milwaukee encountered issues producing the brandywine finish they shifted all of the remaining production to purple.
It doesn’t seem likely that any 2002 machine, much less an early production ‘02 produced in calendar 2001, would come equipped with a -03 part. It seems more likely that the tank was replaced later on under warranty if it wasn’t replaced due to damage. The warranty scenario may not be too far off the mark, considering Milwaukee was having issues with this color at the time.
Sorry if the WAG assessment and general musings troubled you DJ. Irrelevant curiosities are often what goes on here. At least this one was bike related.
Had something that was admittedly an oddball. Didn't know how odd at the time or if there'd be much or little difficulty in sorting it out. Having the friends here to compare against (or to potentially already know a specific answer) seemed worth voicing the question though.
In a PM conversation Jeff and I had already wondered if, given the problems had with producing these paint sets, warranty replacements might play a role here. More idle curiosity. Or, as this process was jokingly described earlier here, more attempt to extrapolate potential answers from minimal known data (wild ass guess).
Your suggestion to more accurately detail what might or might not be happening as merely a matter of extended curiosity has already been asked. Check this thread for the so far limited review:
http://www.cvoharley.com/smf/index.php?topic=43713.0