Looks kind of like this one

V-Moro for Gear S3 Classic/Frontier Watch Band, 22mm Solid Metal Stainless Steel Replacement Business Bracelet Wristband Strap for Samsung Gear S3 Sports Smartwatch 5.7“-7.48”(Metal Black+Clips) https://www.amazon.com/dp/B071XG4BRY/ref=cm_sw_r_cp_apa_q6a1zbHTZHFVZ

Lightning sale for the next 2 hours at $19.

While I didn't find any bands with a tapered width, I did find a nice looking metal band that is specifically designed to fill the gaps in the lugs. I've bought three or four different bands for the S3 and, aside from taking forever to attach the first time, this is the one I happily settled with - Amazon link.