MAME - Bezel Art. How do you trim so only left and right bars are covered?

[delt31]

I have a 16:9 monitor.  I would like the bezel art to only cover the portion of black that exists (I do full screen and then move horizontal in so it's not 4:3 but a little bigger.  I want the bezel to cover just the black bars but the ones I got seem to cover the entire top, left, right and bottom of screen and shrinks the game window so small. 

EDIT - found some here that work:

http://www.mameworld.info/ubbthreads/showthreaded.php?Cat=&Number=322231&page=6&view=expanded&sb=5&o=&fpart=1&vc=1

[headkaze]

You could also check out Marquee2Bezel

[Malenko]

video options -> view -> cropped

there will be some black around the game play area to simulate a bezel.