If the current strap is an appropriate size, you'll want to buy a strap of a similar or equivalent size. When your recent strap is just too long or too quick, then test to select a product that is longer or shorter. Strap lengths are generally measured without the buckle. https://allhealthmarket.com/product/aeahmarket/appleband/business-real-leather-loop/leather-strap-for-apple-watch-band-serie-1-9-and-38-49mm-with-bracelet/