How can I run 640x480 NTSC 4:3 aspect ratio on composite to consumer CRT with RPi3 B+ running LibrecELEC 10.0.3 ?

    How can I run 640x480 NTSC 4:3 aspect ratio on composite to consumer CRT with RPi3 B+ running LibrecELEC 10.0.3 ?

    I doing the following below but is not true 4:3 640x480 NTSC.

    "composite=1" to the kms dtoverlay in distroconfig.txt

    Code
    dtoverlay=vc4-kms-v3d,cma-512,composite=1

    Enable tvout in config.txt

    Code
    enable_tvout=1

    Set mode in cmdline.txt (on the same line after "quiet"). eg for NTSC:

    Code
    video=Composite-1:720x480@60ie

    The results is a squished image that makes eveything look tall and vertically long. It is not true 4:3 aspect ratio.

    I've looked everywhere without sauccess. I would appreciate some help.