I don't have one on my Onzas, but I have the Trophy Taker FC and it's basically the same thing. I had to cut the top half of the containment arm off the bow side of the rest to make it work. It sits in between the riser, and the bridge right under the cable rod. Still looks and works very well, just one side is shorter than the other. Not often the arrow falls off on the inside of the bow anyways. I just threw some plasti-dip on the exposed cut ends, and it works just fine. It was VERY close to fitting without any alterations, so it may fit fine on someone else's set-up. It cleared everything but the "medallion" inset in the bridge.
2006 Rytera Bullet X 60#---2008 Moab 70#
2008/12 Firecat 60#--- 2010 Warthog 70#
2010/2012 Alien X 65# 2011 Onzas 60 & 70#
2009 Warthog 70#---2009 Firehawk 70#
2010 Strother SR-71 65# & 2012 Strother Rush 65#
I hunt, therefore I eat. lol