[1.6.4] Sync ItemStack from client to server

I need to be able to sync an item selected in the clients GUI to an ItemStack inside my TileEntity.

I have created a packet sending method inside my Container:

public void sendSelectedItemPacket(){
	ByteArrayOutputStream bos = new ByteArrayOutputStream(;
        DataOutputStream outputStream = new DataOutputStream(bos);      
        
        try {
        	outputStream.writeUTF("ItemSelect");
        	
        	outputStream.write(tile_entity.xCoord);
        	outputStream.write(tile_entity.yCoord);
        	outputStream.write(tile_entity.zCoord);
        	
        	NBTTagCompound par1NBTTagCompound = new NBTTagCompound();
        	par1NBTTagCompound = selectedItem.writeToNBT(par1NBTTagCompound);
        	String temp = par1NBTTagCompound.getName();
        	byte[] itemStackByte =  par1NBTTagCompound.getByteArray(temp);
        	
        	outputStream.writeUTF(par1NBTTagCompound.getName());
        	outputStream.writeInt(itemStackByte.length);
        	outputStream.write(itemStackByte);
        	   	    
        } catch (Exception ex) {
                ex.printStackTrace();
        }
        
	Packet250CustomPayload packet = new Packet250CustomPayload();
	packet.channel = (ModInfo.CHANNEL + "GuiSync");
	packet.data = bos.toByteArray();
	packet.length = bos.size();

	PacketDispatcher.sendPacketToServer(packet);
}

This should (i hope) encode my selected items data to an NBTTag then byte array and send it through.

I'm then re-making the item on the server using this method:

private void handleItemSelectPacket(Packet250CustomPayload payload) {
	DataInputStream data = new DataInputStream(new ByteArrayInputStream(payload.data));

	try {
		String temp = data.readUTF();
		int byteLength = data.readInt();
		byte[] itemStackByte =  new byte[byteLength];

		int x = data.readInt();
		int y = data.readInt();
		int z = data.readInt();

		String compundName = data.readUTF();
		data.read(itemStackByte);

		NBTTagCompound par1NBTTagCompound = new NBTTagCompound();
		par1NBTTagCompound.setByteArray(compundName, itemStackByte);

		ItemStack iStack = ItemStack.loadItemStackFromNBT(par1NBTTagCompound);

//			MinecraftServer.getServer().get

	} catch (IOException e) {
            e.printStackTrace();
            return;
	}
}

As you can probably see i'm not doing anything with the data i receive, as i cannot work out how to get a reference to the world > tileEntity from the data i receive in the packet.

How would i go about getting that reference, or if there is an entirely better way of doing this then please let me know