Page 38 on your drawings
on drawing 38-- Row g column 6 calls it "rubber channel" and vansaircraft.com store calls is wing root channel. 10.65 plus shipping.
I'd investigate why its not there. My guess is that it was either never installed, or the wing root fairing to fuse gap was too wide or narrow to capture it. the spec is 3/16" to 1/4" pg 38 1,c
I have not installed mine (wings are off) but plan for a 1/8 inch gap and no glue (pliobond or 3m weatherstrip adhesive)