Champion window glazing

Good morning. I am trying to replace vinyl glazing for Champion windows. I saw a previous post from Jean-Marc in Houston who was unsuccessful with the size he bought. I was wondering if he tried a different size and let you know what worked for him. My glazing appears to be about 1/4 tp 3/8 inches in height and 7/16 inches wide. It's hard to measure because it's so brittle and breaks when I try to get an even cut. Hope the photos can give you an idea.
Thank you.