Sold as a set of two.  3/16" brackets for side mirrors that you weld on to your vehicle. 

Sized for 5" round mirrors (not included). Ships as bare metal.

Overall dimensions: 5.5" x 6.1". Outside diameter is 5". If you need a custom size or design, let me know.

The mirrors are not included, but they are available from various vendors from around $12.  Just a heads up... you can find these as flat mirrors and convex, so make sure you are buying the type you want.