Re: kinda stupid but.....
DiMarzios have a standard pole colour, eg all the satch pickups have chrome poles whereas PAF Pros or EVOs have black poles. These are that standard so any stock pickups you order, in any colour, will be this way. DiMarzio are an awesome bunch of guys though, and will make up anything, and every now and again a special order will pop up and have different colour poles, or will be in a funny colour scheme etc etc.
The pics on dimarzio.com all show what colour the poles will be as standard.
To directly answer your question, ANY DiMarzio dealer can get them for you.