Myself also would be very intrested in a nice aftermarket harmonic ballancer, as I've already gone thru 4 oem ones due to cracks at the key way. Like TimZ, I would like to continue using my a/c, with the need for a double groove.
Seems that before I went to the stroker crank, I never had that problem. Also I can say that having to cut so much material off the back side of the dampner for the TEC2 trigger wheel install, it dosen't stand a chance of lasting very long.
Mine has also spun the outer groove peice off it's rubber absorber, rendering the timing marks useless.
So... if anyone comes up with a hit on a better replacement, I'm all ears...
thanks
joel