If your talking about the 4 covers that sit in the roof wells where the bars go into, then i can probably sort you out, or i should be able too, seeing as though i do work in scrapyard.
Best get me a colour code of your vehicle as i might have grey ones, but i defo got a set of silver ones.
I'll do you a deal on them, really depends how labour intensive it is, if its a 5 minute job i'll bribe one of the lads with donuts!
PS. Just making sure yours is a 5DR Hatch or Estate? 2004-2006?