[RM 480 e bagger kit question]

Oops, just noticed my mower model does not appear. Ryobi 38" ride on, RM 480 e. 

[RM 480 e bagger kit question]

Please Help!  I discovered a big hole in the bottom bagger tube today, at the bottom edge, big as my fist, allowing grass to shoot out the rear before going up the tube.  So I would like to replace the tube but am having a hard time finding whether I can just buy that piece. Plus, it seems to be $329 as a kit. Appalling!  And, the kits only show the box, frame and bags. They do not show the bagger tubes. Any ideas?