The ones I saw were kind of corrugated, I am guessing for strength, and raised so they wouldn't touch the glass. It's quite possible that the ones I saw were after market , because I can't find pictures of them.
I thought they took away from the look of the trailer.
I have the wrap around vista windows in front, and the tinted guards look great. Some friends thought that I got a new trailer, when I got them put on. In the daytime you can't see in the trailer but you can see out.