Scott - just the top shroud. I wanted to get both; I really like the look. But it was just too pricey. There's some play in getting the covers centered on the spring, and I can rotate and shuffle the covers so the rubbing stops, but under normal use they quickly return to "rubbing posture". Sounds naughty.
No reason, I guess, that lining the inside of the top cover wouldn't ease the noise in my case as well...