Need clarifications on rubber strap for AP ROO navy

[Anna]

Hi there,

I need clarifications for rubber strap used for AP royal oak offshore Navy (refer pic)..The gen AP usually use black strap or blue strap for this model? Because some of the pic use alligator leather Blue color strap.

If you guys can share the details (diameter, size, etc) it would be much appreciated

[SMP_lover]

Afaik, it should take 20mm buckle( i mean the leather strap) so it's 28 by 20 mm, regular length is 115/75.

[Anna]

tq