Best size Isofrane strap for a 21mm Aquaracer?

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Hi everyone, I have this TAG Heuer 300M Aquaracer Calibre 16 Chronograph Ceramic CAY218A.FC6361 with 21mm lug width. Any advice on whether a 20mm or 22mm Isofrane strap will fit best? Thanks for any tips as I reckon a yellow Isofrane will look awesome on this...