Pretty much any DX7 head will work. They are all made by Epson. The only thing you have to watch out for is some are filled with shipping fluid for different types of inks. In my experience it's not a big problem and if you're worried about it, you can flush it out with a syringe before installing. That being said, Mutoh's official position is that you should use the proper head / shipping fluid for your ink type. But electronically and physically, they are all the same.