wondering why..question on bumper plugs

O.K., how do all of you get the hose into the bumper carrier? For the life of me, I can not get the rigid ends of the hose to go through the void without getting hung up on the mounting bolts inside. I already replaced the mounting bolts with round head truss type bolts but it seems the rigid ends barely clear the side walls let along any protrusion. I was told I can always just remove the ends and install them when needed but that seems to defeat the tight seals of the ends. It's a finger cross moment with the two hose couple in the middle, so removing the applied ends seem risky.

So there has to be some way of doing it I'm missing. Any suggestions?

(The stinky slinky is the RinoFlex Extreme)