Amazon.com.au:Customer reviews: Replacement Fastener Rings Compatible with Garmin Fenix 5 and Fenix 6 Bands(Pack of 11) Silicone Connector Security Loop Keepers Ring for Fenix 5 Plus/Fenix 6 Plus Smartwatch,Black
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I was happy to see I could buy the fastener rings for my Fenix 5X and that they specifically sad they were compatible. I guess that depends on your definition of compatible. Do they fit on the band, yes can you use them the way they are intended - not really, they are a little bit small so you really have to force the watch band underneath. If you have shift or adjust the watch at all it is just too tight and then the band bulges out of place. So I'd say not really the traditional definition of compatible with Fenix 5x.
I wish I had read the reviews before purchasing. Fenix 5 owner and both rings broke within a day or two of each other. Ordered because these were advertised as replacement part fitting the Fenix 5. Too small and I expect they won’t last long.