Yes similar to the Chevrolet taillight. Also used on 1926-27 Oldsmobiles. They did have differences over the years such as the license lens is narrower on the early ones. Actually there are three different widths to the license lens. I have only ever seen the Star 6 lens and they are correct celluloid material so be careful not to use too high a power bulb. Never saw a 4 version. Some 28 Durants use same style of light as well.
Karim has the Star 6 one on eBay presently. 183980500920
The aftermarkets indicate but no pic's of the lights / lens
23967 Tail Lamp Lense with Star monogram for Models L, M, X, X2, 401 50 cents.
23764 Stop and Tail Lamp Lens for Model R 50 cents
Where Are You From? Ottawa Ont
Do You own a car built by Durant? 1932 Dominion built 614 Sedan
The early star 4 cyl cars came with a simple 3” round red concentric glass lens. So you will never find a oval celuloid star 4 lens.
Perhaps over the years owners purchased a replacement chevy style tail lights from one of billy durant parts sales,
(Orphan cars shared parts of other cars)
Our star 4 also came with an add on “curved STOP topper” that was clamped on top of the concentric housing.
Hope you find something you like, happy hunting!