I've never seen Victorinox wooden scales sold separately... It would be great if they were available but I am 99% certain they are not.
(There was a guy on YouTube who wanted wooden scales on all his Vic 130mm Rangers. Sadly they only make one Ranger with wooden scales, the Rangerwood 55. So this guy's expensive solution was to buy several Rangerwood 55s, bust the scales off them (carefully) and stick them onto his other Rangers. Completely bonkers way of doing it but maybe the only way of doing it... sorry I can't give you the link, a quick search didn't retrieve it. I think it was some German kid.)