I recently replaced the windshield wiper blades on my 2004 XC70 for the first time. When I removed the old wipers, I noticed that the drivers side wiper had an air scoop that the repacement Bosch wiper did not have. I assume that it is there to keep the wiper in contact with the glass at high speeds. Can anyone tell me what problems I will experience without this air scoop. If it is a problem, where can I get a replacement blade like the original? How much should I expect to pay? Thanks.