Hi again can anyone help me again I'm just ordering sum km hexs for my yama buggy got a set off bak wheels for it already if I order the hexs of rc modelz do they cum with the grub screws or do I av to buy them separately and one more thing can I just do the hexs on the bak n leave the squares on the front and do I av to use a washer like the old wheels or do u just buy the proper nuts that go on the hexs thanks