[h=1]D seal for the slides part number:
AP Products 018-312-EKD D Seal for EKD Base, Black, 1x15/16x35'
Wiper seal if needed:
AP Products 018-341 Black EK Slide-Out 1/2" x 2-3/4" x 35' Seal Base w/2" Wiper
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You can find them on Amazon, Ebay, and a number of places. Measure the footage you need and then order. To replace the D seals it runs on a track. Sometimes a screw is inserted in the end or ends and a thick bead of RTV silicone is on the end. For the top horizontal without slide toppers, a bead of silicone is run along the top and bottom edge to keep it in place. The edges are held in place with a screw top and bottom inside the D seal about an inch in. For a difficult insert, I have used soap spray to help the D seal slide in.