I found a zipper replacement site incase your rear side window zipper breaks on your best top. I have a 1991 YJ and My rear side window zipper broke and the zipper kits would not work because my retaining box was broken so I researched and found #10 YKK 30" Separating zipper at perfect fit.com. Part # is DK-1030 for $3.13. They have different lengths too including entire rear window zipper replacement for wranglers. Went to cleaners who did leather repair and they sewn it on for $18. A shoe repair would be another alternative. Hope this helps.