I have several windows with chunks of glazing bead that are missing on the exterior of the house. Need to find replacement bead that will fit. Do you have this, with white as the preferred color?
The opening to the window channel looks to be between 5/16" and 3/8" wide, but there's a bit more width inside the channel itself due to a small "ledge" at entry point.
I have more photos, if it helps.