As far as I know, one doesnt exist..there would be too much mechanical noise anyway to be useful. For piezo trems, you have 2 choices right now: Strat 6 saddle, or a Wilkenson. I'd go for the Wilkenson, since it is more precise, has less mechanical noise and quite frankly, sounds better. For piezo systems, I recommend the RMC system: www.rmcpickup.com