I try to keep my '67 pretty original-looking, but it's always bugged me that when driving it, I can hardly see anything out of the small round side view mirror. Just to see if it would improve things, I decided to try replacing my (reproduction) 5" round side view mirror with a new one I found online. The new one is also a black 5" round mirror, but has slightly convex, rather than flat glass like the originals had. Here's a comparison of the front of both mirrors. The old one is on the left, and the new one's on the right. The new one has a slightly smaller lip around the edge, but is otherwise virtually identical to the old one. It even uses the same 5/16”-18 mounting bolt. The view when looking at the two mirrors from the driver's seat, however, is dramatically different. In order to show as accurate a visual comparison as possible, I took both of the photos below on the same stretch of road. The standard flat-glass mirror is on the left, and the convex one is on the right. Those pursuing a factory-level restoration may not be interested in doing this, of course. But in my case, I'm going to keep the convex mirror installed, simply for the sake of safety and a better view of what's behind and around me. I'll have to keep in mind though that the convex mirror makes things appear to be farther away than they actually are. This particular mirror is apparently a replacement side view mirror for a Freightliner truck - it's a Velvac 708521 (or Vel-708521). Here's a link to one on eBay that's the most reasonably priced I was able to find: https://www.ebay.com/itm/133943845109?hash=item1f2face0f5:g:HZIAAOSwWzVbqf9Z If you try to buy one from this source and they're sold out, check back again later, as they only list two at a time, but evidently have a number of them in stock. I believe these same mirrors are available in chrome as well, though I don't have the part number for that version.