What is the width and the height in inches? Do you have corner pieces?
Decimal inches are available on the drawing as seen below.
The height of the extrusion is 0.35” / 3/8" / 8.9mm for the profile and including the cover is 0.43” / 7/16" / 10.9mm.
The width is a total of 0.89” / 7/8" / 22.6mm , but the inner part for the LED strip is 0.81” / 13/16" / 20.6mm.

