3/8 glazing bead

I'm afraid I can't quite make out your bead from this photo. Would it be possible to see a clear picture of the end profile?

I know that your original sample is probably very brittle, but please try your best to show us an undamaged sample. The more of it that has broken off, the harder it will be for us to ID.

That's a huge help, thank you so much! Looking at these photos I think your best bet would be our 55-202. Look it over and see if you agree. Make sure to check our dimensions, too, just in case I'm reading your measurements wrong, and let me know if they differ significantly.