Quote from Pintosh on April 1, 2022, 6:44 pm

The part number is usually found on a label near the tongue of the seat belt which makes it easy for a customer to match up the part number from their existing part. Automotive belts start with either 4L which is 12.5mm wide or 3L which is 9.5mm wide. The number following it is the outside length of the belt in tenths of inches. The inside length of the belt is typically 2" less for a 4L belt, and 1-1/2" less for a 3L belt. An example would be 4L460, which would be 46" long outside, 44" inside. I guess product spare parts manual should be available online.