They have nothing to do with mounts. Those are upgrade stones in which you can upgrade your gear and make it stronger. Simply go to the armor merchant in Korin City, Click the boar not the armor merchant, put ur gear in the slot, put the stone in the other slot, then your gear is upgraded!
Notes: Stone LVL HAS to be the same or higher as the armor you want to upgrade
Blue Stone: Armor
Red Stone: Weapons (Gloves/Staff & subweapon)
Purple Stone: Usually upgrades weapons by 3 times sometimes 2 and sometimes 1
Green Stone: Same as purple but for armor
Ah I see! I just assumed since the Tab in the token shop made reference to "Vehicle" that it was for mounts. My mistake. +1 PL for you
they are meterials from the old craft system which i believe you can still use but for lame stuff like lp and ep stuff better to just sell it in my opinion