Yep - thems the ones. They're not unobtainable, but you can't go to Midway or Brownells and just order with a click. It's also "buyer beware" now, so be sure those you buy on ebay are exactly what you want. For example, those in the link have squared off front ends, whereas newer guns have rounded front ends.
Here's a pic of my 1° (primary) match gun with Millett rear sights (on bottom). My "2°" 686 (soon to be my 1°) with stock sights is on top.