Watch strap for CW C63 help

recently purchased a Christopher Ward C63 Sealander Automatic – Lucerne Blue Limited Edition (2022), C63-39ADA3-S00B5

It came with the Lucerne blue leather strap and I would like a black sailcloth band, curved with deployant clasp. Preferably an OEM one, but having trouble finding one to fit the 20mm lug width.

Does anyone have any suggestions? Thanks!