Very easy, just use the same patch of l2 Race Supermacy... This will work only if you have the same client, otherwise forget about these weapons...
If you have the same chronicle then just copy the system of the L2 RS and use it for ur server patch just change the l2.ini
Then open ItemName-e , find the weapons you want, write their IDs down on a paper and add them to your Datapack and database, spawn them In game and you are G_G