I don't know what brand of sill I have but I took a chance and it fits great. I had to completely remove the storm door and frame to avoid cutting slots in the extension, but the clean install was worth it. I had concerns about gluing because there isn't much flat metal on the underside of the extension, but I glued it down with Gorilla Max Strength construction glue and weighted it down for 24 hours and it was rock hard. The edges still need caulking but I am very happy with the product and the results! Sorry for the mess in the photos...it rained for two days.
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