I'm trying to find a way to mount an NP1 battery and a wireless receiver on the back of an XL2. Are those holes on the back plate standard? In other words, could I just mount these boxes on there no problem?

BEC | AT-1820 Wireless Reciever | BEC-AT1820 | B&H Photo Video (http://www.bhphotovideo.com/bnh/controller/home?O=workaround.jsp&A=details&Q=&sku=481481&is=REG)

BEC | NP1 Mounting Box - Extra NP1 to Video Cameras | BEC-NP1 (http://www.bhphotovideo.com/bnh/controller/home?O=workaround.jsp&A=details&Q=&sku=283979&is=REG)

Frezzolini | NP1-CB Attaches Extra NP On-Camera NP-1 Box | 96604 (http://www.bhphotovideo.com/bnh/controller/home?O=workaround.jsp&A=details&Q=&sku=77706&is=REG)

IDX | NH-100 Single NP-1 Holder Box | NH-100 | B&H Photo Video (http://www.bhphotovideo.com/bnh/controller/home?O=workaround.jsp&A=details&Q=&sku=133902&is=REG)