What spline do I need?

A quick learner says:
Will you please tell me the correct way to identify the correct size spline I need? The channel the spline fits into on my screens is, .125. Do I need to order the .120 spline? Any help in this matter would be greatly appreciated.
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Paul from SWISCO responded:
Thanks for posting. I believe that our 59-120 would be the closest match that we can provide. If you go to the next larger size, it may be too big.
SWISCO Foam Screen Spline
SWISCO Foam Screen Spline
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