ok so I have been thinking again.
on most road bike the width of the bar I am sized to is either 42 or 44 cm i just checked 6 mtb or hybris type bars and they are all 65 to 68 cm one was a small 62
flat bars are way wider. i was under the impression that the bar ends were to approximate the location of hoods. some peoepl recommend mounting them on the inboard side of the grips.

how many people cut down their flat bars (or riser bars whatever) what is the space between your bar ends if you use them.
mine at the end of my bars so probably 60 ish