Just got my twin pack of Behringer B-5s from 8thStreet.com but I really should have read the description a bit closer. I figured it was the same box deal as other sites were offering so the stand adaptor would be the t-bar (that's the name for a twin mounting adaptor, isn't it?) and the shock mounts would be there as well. Not so, it's actually just two boxed B-5s with single stand adaptors. Stupid me for not reading the description more closely.
Now I need to track down a t-bar! And mounts. Ah well, live and learn.