Thank you for supporting Barton Watch Bands. We have fit thousands of 20mm lug width timepieces but these particular Garmin models have been giving us some real trouble since they were released a few years back.
We had some discoveries that raised a red flag and we have since pulled these Garmin models from our list of suggested/compatible smartwatches. The actual lug width of these particular watches actually measure closer to 20.5, and we have had customers reach out to us that our 20mm bands pop off of their watches, due to the manufacturing inconsistencies. The frustrating part, we have had cases go both ways which have made things even more challenging for us. We have reports that our bands work great, as well as reports that the band doesn't fit and pops off. We even had a husband and wife who both had a Garmin Vivoactive and our 20mm straps worked on one watch but not the other, which is extremely frustrating for us. The last thing we want is a lost or damaged timepiece for any of our customers. Unfortunately, we do not recommend using our bands with these products. We actually have a disclaimer on our website and on Amazon specifically for these watches.