seal a 1/2 inch polycarbonate storm shutter inside a 5/8 u channel

Hello,

We don't carry an exact match for your seals, but the 59-067 5/16" Frame Drop-in Glass Spline or 59-068 Universal Glazing Spline may be worth considering. We can't make any guarantees, but carefully review the style and dimensions to determine if one of them might be a good fit. Thanks for posting! 

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