The kit contains all the necessary components for regeneration. One note is that the new seals have a minimally longer lip, which in my case caused a situation where, after releasing the handle, the initial pressure on the piston closed the fluid backflow hole into the reservoir when the brakes were heated. A slight filing of the stem took care of the problem and now everything works as it should.
I got a different piston than the one in the picture. It's smooth, it doesn't have that spiral, it's thicker in that area, but overall the dimensions are the same and it fits perfectly with the original pump on a 2006 TGB Orion 101S.