Good news! Nice site with attention to detail and hopefully they offer again the special M2.6 screws for Koetsu. Strange, that Koetsu Japan send the carts with aluminum transport bolts only.
White paper gives the first sign that there are two types of platinum magnets for stone Koetsus.
FWIW, I used Soundsmith EZ mount hardware for a Koetsu Jade which had threaded mounting holes, which worked fine. They are listed as M2.5 so 2.5 mm should work fine for the threaded holes. The EZ mounts are nice because they come in different materials/weights which allow you to add effective mass as required. Good luck
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