I bought the Dymoece Adjustable Out Front Bike Computer Combo Extended Mount from Amazon and have been quite pleased with it. Need to measure the distance between bolts on the stem clamp to make sure this one will fit your setup.
I personally use the Most iTiger Stem Plate ( https://www.thecyclery.ca/most-itiger-bar-mount-with-bracket-for-computer-an.html )
Or any of these mounts from Amazon will do
https://www.amazon.ca/Dymoece-Front-Computer-Garmin-Touring/dp/B07PM2HYRW/ref=sr_1_4?crid=2NJ6BUR4D54M0&keywords=out+front+mount&qid=1665014154&qu=eyJxc2MiOiI0LjAyIiwicXNhIjoiMy4yNSIsInFzcCI6IjIuNTkifQ==&sprefix=out+front+mont,aps,86&sr=8-4
Amazon has tons of of these, for example:
​
Also, check out K-Edge. They don't have exactly what you are looking for but make really high quality stuff. I like their stem-mount for my mountain bike, and component-specific mounts for various road bike bars.
https://k-edge.com/product-category/computer-mounts/garmin-mounts/