Aladdin brand "Heelless" chimney (#R910)
Fits Models 3 thru 11, and model 23 (for use with heelless chimneys)
Measures 2 5/8 inch by 12 3/4 inch height and 3 inch bulge
All glass chimneys will vary in thickness due to the manufacturing process. They will fit the holder/burner specified in their description.