Have you tried contacting Yokohama customer serivice? Yokohama is among the most reputed companies in Japan and their tires are far better than Bridgestone, as a matter of fact, Yokohama Geolander and OEM on Land Cruiser and Pajero in middle east and Australia.

I have raced with the Yokohama A008 and have trusted my life on them, had bad luck with Michelins though, the MXV tread came off the tire at around 18000km on my Golf GTi 16V.