Polished Brass Lightolier Bell Track Lights. They will fit on M.
A lightolier dealer in your area might also carry them, you can search for them on the lightolier website and call to ask. Is in overall great condition. The Bell Lights first appeared in a 1981 lightolier catalog. This is a beautiful set of lights, they have a very classy warm tone to them. These are the 100-250 Watt screw in option which was the biggest of the three options they offered.7" across and 10.25" high from tip to tip straightened out. Can't locate markings on the Sconces but they have a leviton light fixture and a power switch that reads GILBERT / NYC / MADE IN USA. I believe this dates them as well, although I can't say to which brand.
I know Lightolier had a three tier sconce in this color, but can't find a single half cylinder in any catalogs. You don't see these often! The item "6 VTG Polished Brass/Gold Lightolier Bell Track Lights & 2 Matching Sconce 250W" is in sale since Sunday, March 31, 2019. This item is in the category "Antiques\Architectural & Garden\Chandeliers, Sconces & Lighting Fixtures". The seller is "wontstop" and is located in Austin, Texas.
This item can be shipped to United States.