Another voice for Tom Molnar(Molnar Technologies). Tom founded K1 many moons ago and is a good guy. You will spend a few more bucks piecing it together this way, but you'll know exactly who made ALL your stuff and be able to put a really good piston in your motor.

The reasons for choosing Molnar aren't just because he's a good guy; Molnar's stuff is made of good material and measures as well as any aftermarket company's stuff - better than almost anyone else's.