Coming coming must take photos first. Here ya go.
Naked - notice the huge rear glass element of the GW3, and also the ring is off from the GR.
With the hood and adapter. Hood goes back into the box - the adapter alone makes a good hood anyway, and even without the adapter the recessed lens element has a hood around it already. Just for the GW3.
With the GW3. Rubber hood goes back in box. It is a pain for the GW3 to screw on to the adapter.
The hood is quite tricky to put on the adapter. It took me close to a minute to find the alignment spot and click in. No apologies for my ugly gaffered-up GR.
To sum-up - don't buy the hood and adapter just for the hood and adapter alone. It's pointless. Only if you are using the GW3 wide converter, then buy the hood+adapter. My GW3 is always attached to the adapter now, and comes on/off the GR as one. Both hoods are left back in box, along with the ring.