I found my Linhof 6.5x9 plate/film holders and they are not graflok compatible, they need a spring back. Maybe there were some versions that were, but mine aren't.
I have seen other spring backs adapted. Most common seems to be 6x9 graphic sping/graflok back, probably because they are common and cheap. One that might be worth a try--glennview.com. He has new Galvin 6x9 backs. I'm not sure the size but they are a spring back that opens wide enough to slide roll holders underneath as well. One might be adaptable to an arca swiss 110mm size.