Be aware of that a SC-545 is at minimum 13 years old, and if you need a complete set of heads, this machine needs 6 (!) heads, 12 (!) dampers, 12 (!) new ink tubings, 12 (!) new ink cartridges, 6 (!) new Cap Tops, 3 (!) new pumps and so on.
And from your VP540, you will go one generation back...