Does anyone know what model/part number the Bilstein shocks are on the '09 RX8 R3?

I went to Bilstein's website, and list "applications for 2004 - 2008 RX8" and they only make the "HD" line for our cars.

Is the '09 R3 riding on Bilstein HD's?

I don't know for sure, but I'm guessing that they are not an off-the-shelf shock, but something custom that you can only get through Mazda... like the Recaro seats.

provided directly to the oem by the manufacture.. specialized application.

Okay, how about the PZ edition of the RX8 in Europe? That is running on Eibach springs and Bilstein dampers... what dampers are those?

Again, my best guess would be that the same custom Bilstein shocks are in the PZ, the 40th Anniversary and the R3 (I know there is some change to the rear suspension geometry on the 09's, but I don't know if that means you need a new shock).

Mazda did the same thing with the RX-7 special editions. The RZ, the Bathurst R and the Spirit R all used the same custom Bilstein shocks.