replacement glazing beads
I'm afraid that we don't sell retainer strip like this. The problem is that every manufacturer makes a different style retainer strip, and even the same company will make (and then discontinue) multiple different strips in a brief span of time. It's hard to keep up.
We have a few tricks up our sleeve, though. The first and easiest is to cut your existing strip into smaller, equal portions and distribute them around the frame. You don't actually need the whole strip to keep the screen in.
You could also use a clip like our 70-180 clip at 33-020 screw. Like before, you'd distribute these evenly around the frame to keep it in. This is how it was done back in the day and it's a method we still use all the time.