Slightly larger than the stock discs, a little less slip. Run the two standard ones in the basket and it'll be kind of even.

If you hadn't bought the basket, two garodiscs are okay. You can run three garodiscs, but I suspect that it will bias the torque too much to the rear. That's what happens when you run three HD pads in the basket decoupled.

Now that I have the whole 540 thing figured out, I'm going back to experiment with a decoupled slipper. I may even take the basket out.