brassmonkees

I have recently bought an XTR and the roof bars were positioned up (across car) when i bought it. I wish to postion them back in there holders (along car) but the screws that were used to position the bars across the car are far too long. Am I positioning it incorrectly?? or are there 2 sets of screws, 1 for when bars in use and 1 set for when in holders?? please help, i tried contacting local citroen garage but they did not understand/were not interested.