I see he now list new production pistons, subtract the 19% tax and the price is pretty good, unless you live in Germany...
He used to sell NOS piston kits but they were over $1000.
Lucien... you see that all the time. Take any standard Kawasaki part and add Z1 to the description and the e-bay price doubles.
Nice tip about the headlight bucket. Also Dennis Kirk sells replacement turn signals for the kz1000's that are identical to the kz1300 except they are chrome, paint them black and you have the same thing for a fraction of the cost. Or leave them they look just fine either way.