I have to admit I was kinda sceptical about the fit on these mirrors when i saw them . but, after recieving them and putting them on the truck I was amazed how well they fit and the ease of installation. Great visibility and NO vibration.
I just returned from a nearly 9,000 mile trip to Alaska pulling a 30' trailer with a 1999 Ford Expedition. I took the scenic western British Columbia route which has to be the worst road in a developed country. We returned via the Alaskan Highway which is a close 2nd. Everything bounced and shook for maybe 2,000 miles of very rough road, these mirrors held tight and worked great. Inside my mirrors the mold number is SB002.