BKL if yellow stitching was unavailable, You should have gotten the boot with white stitching and used one of the fabric paint markers to color them yellow. 😁
The black stitching didn't bother me. When I first bought the Lime accent SLR seats, I was concerned about the Lime seat accents clashing with the Yellow I had my Slingshot painted. I ordered some paint from Angelus Direct with the intention of recoloring the seat accents, but decided I was OK with the two colors. Angelus Direct specializes in paints and dyes for athletic shoes and vinyl products - https://angelusdirect.com/.