I had this question pop up on a facebook page and thought I would share it and allow people to add to the list.
BOW GRAPH MOUNT SUPPLIERS
https://www.tackledevelopment.com/.../td-electronics-mount
https://boatlogix.net/product-category/bow-mount/
https://www.balzoutllc.com/garmin-mounts
https://www.bassboattech.com/.../rang.../all-ranger-products
https://thmarinesupplies.com/.../dual-kong-electronics...
https://precisionsonar.com/products/
https://mealeymarine.com/collections/electronics-mounts
http://prociseoutdoors.com/dek-it-mount/
https://comfortroll.com/shop?olsPage=products
https://www.tacklewarehouse.com/Comf.../descpage-COMFOD.html
https://www.rammount.com/activity/fishing/gps