IW371446- Strap size/ length

Hi All

I would have thought this would be an easy answer to find online and on the forum but can someone please confirm the strap width and standard length for the 3714? I believe width is 20-18 mm. Does that mean it tappers to 18 mm and any replacement strap should be 20 mm wide?

Thank you!

IWBrown

Width for the lugs = 20
Width for the buckle = 18
Standard length = 115 X 75

Regards,
Jack Freedman

Thanks!