Originally Posted by Chris Peralta

Well I would not suggest changing just the piston. When you change those you should change the piston, sleeve, and rod.

1146-53 is the part you want.

1146-33 will work but is the X10/X11 so it is only 3 port, not 5 port like your B10.

1143-7 will also work but is a 7 port not a 5 port.