Strap IWA19247 for IWC 3717-01: Standard or Small?

Can somebody please confirm whether the IWA19247 strap is the 'standard' size or the 'small' size? It fits me tight and my arm is not that big. Can somebody tell me the correct part number for the black crocodile strap in a LONG size? Thanks!

The straps for the 3717 are

IWA 19247 standard size
IWA 19248 XS
IWA 19249 XL

Michael,
Thank you! The IWA 19249 would be 10 mm longer, correct?

Unfortunately not. The XS is -20mm and the XL is +20mm from standard. But 20mm equals only .79 inches.