I don't know who designed the sun visor on the 550 but it's not on par with the 460 which had side extensions to my recollection. The one on the 550 doesn't have any and is not wide enough to cover the gaps on both sides when the sun is low. I have been looking for a solution and came across this sun visor extender on Amazon. The quality is decent, and the extension parts slide on both side and down too as needed.