Sprockets for Gen 3

[dcnblues]

I'm having trouble finding compatibility between a gen 3 and Supersprox stealth (steel on the outside / aluminum on the inside) hybrid sprocket. The online ordering web page won't match up with a gen 3.
-I take it older sprockets won't fit on the new bike, has that been confirmed?
-My understanding is that they stock rear sprocket is aluminum. Is that accurate? What is the stock front sprocket?
-I'm also finding contradictory information that perhaps hybrid sprockets don't actually save any weight from a steel one. Anyone have any weight specifications for application on a Hayabusa they can share? Thank you.

ps Heal-Tech Speedo-Healer is also not yet out for the Gen 3. Are there any others that can correct the speedo error?

[sixpack577]

The front sprocket is always steel.

Consider a SuperSprox rear sprocker has an aluminum center, but also has fasteners to hold the steel toothed ring on. So weight savings may not be much.
It is strong and will last a long time though.