Below please find a selection of 26mm watch bands available on Amazon. The 26 mm size is sometimes found on larger watches, though it’s always important to measure the distance between the watch lugs with a metric ruler to be sure you’re selecting the right watch band size.
The length of the watch band is also a consideration, and this depends on wrist size. The placement of the band holes also affects the wrist sizes the band can accommodate. Good luck in your search for 26mm watch bands.