I cross-posted the following question at another forum, but unfortunately didn't get a satisfactory answer, so I thought I'd try here at dvinfo and hopefully have better luck:

I need advice on finding a solution for attaching my Sennheiser EK 3041 wireless receiver to my EX3. I want to attach the Sennheiser to the rear shoe mount on the camera… but I haven’t been able to find a shoe mount adapter that will accomplish this, so far. Any recommendations on a shoe mount adapter and where to purchase it? I’d be fine with a shoe mount attached to a flat plate (or cradle) that I could then attach the receiver to using some velcro. I'd like to avoid using bracket arms and such that attach under or to the side of the camera.

Thanks,
Rodney

How about this one
B.E.C Horizontal Hot Shoe Adapter with Plate - Mounts - Wireless Accessories - Trew Audio (http://www.trewaudio.com/store/product.php?productid=966)

and the Sennheiser CA2
B&H Kit Info (http://www.bhphotovideo.com/bnh/controller/home?O=details_accessories&A=kitInfo&Q=&sku=328035&is=REG&friendly=Sennheiser_CA2_CA2_Shoemount_Adapter.html)

That's exactly what I'm looking for. Thank you!!