Sounds like he meant a connector not a bushing.What do you mean by bushing exactly? Are you talking about an NM connector?
What do you mean when you say "fishing into the panel"? Are you talking about just adding a cable into an existing recessed panel or making up a new panel? If the former, the one linked in post #3 goes in from the inside.Are there bushings that are designed to be installed from the inside of a panel? Not just strait bushings but something with strain relief Would come in handy when fishing into the panel. Seems like this should exist.
thanks