vintage Gerkin sliding aluminum windows

I am looking for I guess its called sliding vinyl window glazing bead. These windows are in MN and I am fixing up all the windows in this townhouse from the mid 1970s. I was having a hard time getting a clear shot with the tape measure in the picture but the measurements are 1/2×1/2×1/2. The window sits down in this glazing bead and the glazing bead sits inside a track in the window and the whole works slides side to side to open the window.