Patek Philippe Aquanaut rubber straps in this collection are listed as "uncut," meaning they haven't been trimmed to a final buckle length. Each listing specifies the lug width and compatible reference numbers (e.g., 5167a, 5167r, 5164a, 5164r for the 21x18MM strap; 5168, 5968 for the 22x18MM strap). Match your reference number to the listing before purchasing. If your reference isn't listed, contact the store with your model number for confirmation.