Those spots look like the anodized aluminum spots from www.standardrivet.com. If that's what they are then they have two prongs and you can just use an exacto knife to make 2 slits where you want to put the spot at and then push the spot in and fold the prongs over on the back. However, I don't recommend the anodized aluminum spots for anything that will be heavily used. The website is right that the color does not peel or chip, but it does scratch off very easy. In fact, while I was trying to set them on a "trial collar" I had to toss out a few of them becuase they arrived scratched. Most likely from rubbing against each other in the packaging, but my customers who orderd "trial collars" have reported some of the spots have no color on them after 3-4 weeks.
Also, I highly doubt a spot setter would work with these spots because they are made with lightweight aluminum and crush pretty easy.
Hope my info helps
