A little padding taped into the seat is no problem. I would guess that you are a #1 size seat. Most seat manufacturers will need your hip measurements, and your under arm/chest measurements. Get the seat that is the closest to you. If your close to a size don’t go down in size and hope it will fit. Your better to get the next size up and use some kart padding. A large seat will be way to big for you, even a medium may be to big. Best of luck.