Looking for a rubber strap

Hey there forum.. I bought a Aquaracer Caliber 5 WAY2013-0 and I love it... Would like to see if I can find an orange rubber strap for it. I saw this watch and would like to get it but on the site it says it is discontinued.

Any ideas how many mms wide the strap has to be? I'm seeing anything from 20mm to 22mm...