Your mirror will come apart, might be tricky.
I've used a "small" flat blade screwdriver about 5" long to release the tabs that hold the glass.
There should be a part # on the broken part.
Google is your friend.
Check these links.
https://rvshare.com/blog/rv-mirrors/
https://www.velvac.com/products/v-ma...convex-glass-0