Snap-In Vinyl Glazing Bead
The 55-204 is certainly a possibility, but I wouldn't trust Chat GPT with this kind of thing. We have a lot of customers using that now and I haven't seen it actually get anything right even once. Most of the time it just complicates what are otherwise simple projects.
There are a lot of glazing bead styles that fit this general profile, 55-204 among them. Other possibilities are the 55-006, 55-196, and the 55-212. Between the four options I think 55-212 looks the most like your old glazing, but it will come down to size.
We unfortunately can't garner precise dimensions from a photo of a tape measure, so the final determination on size will have to be yours. Review these four products, starting with the 55-212, and see which one is closest in size. Note that your old glazing is likely warped or deformed after years of being installed, so you may need to do some mental adjustments to compensate.