Front Brake Pump?

Any suggestion for a second hand front brake pump better tha the original? At what bike i have to look tha has the correct pump? Mi bike is a 2003 speed triple (955)

 

Exactly the front brake master. I do not want to change the calipers.

 

I will try to better explain my need. I' d like to improve my front brake changing the pump with something newer and more powerful, radial. I understand that the pump must be a 19X21. Does any of you have experience on such a swap?
Naturally i know that I can go to a store and buy a brembo or Nissin 19X21 radial pump but it is really expensive. On the other sied iI undestrand tha meny old honda and Suzuky have such parts that is for me esy to find used. But which one I have to search for?