In addition to those mentioned I think Hogue does. The ones that have an exposed backstrap will have it partially covered at the base. I have a pair of the Uncle Mikes Spegel design on my 686-4 which is a round butt. Completely covers the backstrap. I don’t like the partially covered backstrap transition thing so these are perfect for me and great for shooting. No longer made but you can sometimes find them on eBay.