item-level targeting Wireless Network Policies

Hey,

I have to link a GPO to two Sites. So I searched for the registry-keys and added them. I used the item- level targeting for the GPP's and added the Sites. But I have also a Wireless Network (802.11) Policy which i have to link to the Sites. Where can i find the reg-keys for this policy? Is there a solution or does item-level targeting only works with preferences?

Thanks for help