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can you add a roof rack after purchase?

Yes you can..Somebody posted great step by step instructions along with pics yesterday. But its not for the squimish...drilling holes in your roof  :D
One of the members just installed one, although it is not an 07 I imagine that there would be no difference as far as roof racks go
Yes you can I know I read on here somewhere about aftermarket ones.
I believe the 02's roof racks were dealer installed which caused rust problems because some dealers didn't clean off the savings from drilling the mounting hole or silicone the holes to prevent leaks and rust.