Determining proper spline for Okna window screen

A home owner from Middletown says:
I have 12 vinyl replacement Windows mf'd by "Okna". They are over 10 years old and need new screen. There are no markings on the screens. They mount on the outside of the window front edge and slide up and down on this edge. They are 3/8" thick. The inside frame is 7/8" wide and the outside face is 1- 1/16" wide. The screen groove is 1/8" wide. Want to install alum. Screen in place of f/g screen. I have ordered a screening tool from you with a3/32" thick wheel. What do I need for spline (approx. 150 feet)?

Mel
User submitted photos of window hardware.
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Paul from SWISCO responded:
Normally, for Okna window screens, we suggest our 59-150 screen spline, which works for aluminum screen wire. This is just a guess, however. You'll still need to confirm that the measurements of your part match what we offer on our site.
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