There are lots of reputable vendors out there. Most give you a place to select your bike's name, model, year... and "match" what will fit under different categories of aftermarket parts. Here's a link to a 15T sprocket that fits your bike. I took a quick look and found this one. There's also RevZilla, Cycle Gear, Dennis Kirk to name a few other places.After reading the number of posts on this swap, I've got the urge try it out. Going up one tooth helped my old CB360T back in the day. My bike is a 2021 CB300R.