OG-EVKIN CM-02 carbon bike computer mount. I’ve been using these models for some time and they are ideal.

• Weighs under 30 grams including titanium alloy bolts, washers and screws
• Easy to install and fits popular computer models and most stems
• Fit with or without the underslung attachment for a light or GoPro, different length screws are supplied
• Strong and secure, T800 carbon
• Coated alloy spacers
• Great buyer feedback

Also compatible with Xoss, Magene, iGPSPORT, Blackbird and Rockbross computers which also use Garmin fit

Attractive 3k carbon weave which also makes it very sturdy. 

Please note the internal width of the mount bracket is 36mm (see diagram), the bolts fit into the bottom 2 bolt holes on your stem (or top if you choose).  This easily accommodates most stems but I have encountered an oversized FSA model where the bolt spacing was too wide so please check before ordering.

I have tested this on a large Garmin 1030 and it fits with plenty of clearance to the bars.