custom aspect ratio external output

Hi friends,

I'm using Final Cut Pro X 10.1.1. Most of the projects I work with is in 2.35 aspect ratio (cinema scope).

While working with HD projects, the project setting I use is 1920*817.

I use a blackmagin ultra studio 4K for my display output. The projector I use is Panasonic ae8000.

The images appear on my projection screen is lil' squeezed as ultra studio 4K outputs 16:9.

Is there any solution for this? Can I output 2.35 aspect through ultrastudio 4K?

Thanks in advance,

Sreekumar