Tube plug (Blue Ox Tow Bar)

I was doing an over haul of my Blue Ox towbar. (used to tow a vehicle behind a RV) There are four plastic plugs that prevent dirt/water from entering the tow bar arms. The original plug was a square going into a trapezoid mounted on a cylinder. Factor gobs caulk to fill in the gaps. One of my plugs was missing, so I decided to print replacements with a better fit.

Perfect example of how a custom 3D print can improve original design. i.e. don't put square pegs into holes that aren't square!

Photos show towbar, original square plug, test plug for fit, red plug in PETG. If the red PETG doesn't work long term, I will change to ABS or TPU but didn't want to fool around with the filament and printer settings.