New steering coupler doesn't fit!

Sorry but this does not make sense. Picture an assembly line, "back in the day." Cars lined up for "miles". Assembled COLUMNS lined up for "miles."

Here's a box with no master. You think they stopped the line to "sub" (the proper color) column with that special "no master matching coupler?"

I bet "something else" is wrong. Like maybe it's full of age hardened debri? Hell I don't know.