Answer: If the other side of the band still didn't fit. There is a insert on the factory installed band. That insert is made of hard plastic and sometimes won't come off easily with the elastic band. So some people experience that problem thinking it does not fit. If you remove the old band, make sure that hard plastic stub also comes off from the body. As long as you have that insert (hard plastic portion) removed, this band fits and installs easy and fits just fine.

Compatibility
Match your Garmin Vivosmart HR activity tracker to your daily outfit and style with colorful wristbands. Mix and match from eight color options.

Feature
Material: Silicone
Models for selection: Only For Garmin Vivosmart HR (NOT FIT GARMIN VIVOSMART HR+)
A good replacement for your old and broken strap.
Free size that adjust by the button site. Choose different color to change mood in daily life.
Easy to assemble and remove through pins, with Screwdriver and Nuts.
Note: Replacement bands only, not include the tracker.

Package Included
1PC Screwdriver
4PCS Screw nuts
1PC Soft Silicone Band for Garmin Vivosmart HR (No Tracker, Replacement Bands Only)