I bought a set from Ames a couple of years ago. Round caps for snowflakes. They snapped in with a bit of persuasion and feel a bit loose once installed. I was concerned at first with loosing them driving down the road. After many (but not nearly enough) miles they have held on fine. I have heard some guys will wrap a run of tape around the prongs before install but I did not thinking the 'prong' would not grab properly. All in all I am happy with them.
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