sliding mirror closet door floor track for concave wheels 83" length 3" width

Hello there. I am afraid we don't carry a track for concave rollers in this exact length, but you could adjoin two tracks together, like the 47" 23-270 track for concave wheels, and then cut off excess length with a hacksaw like our 75-023A. See the end profile dimensions of the 23-270 below. The overall width is a little different, but if the distance between the rails is the same, I think this could work for you.

Profile view of bottom concave roller track