Problem comes from the fact the the mower was designed with a manual PTO when the electric clutch got shoved on things had to be worked around it.
The outside of the housing is grounded so tapping it with the tie rod will not cause any electrical problems.
A tie rod always goes through an arm square to the arm otherwise it will lift rather than push left right.
If you look at the angles at the end of your old rod compared to those of the replacement you will see the old ones are square on to the arms while the new ones are at an accute angle.
So that would indicate the original rod had a bend in it from new to clear the PTO clutch and the new rod requires the arm to be twisted which would lower the entire rod.
I would hazard a guess that newer models have a modified steering arm to take the strait tie rod as a bent tie rod is extreamly bad / lazy / cheap engineering and thus very commonly used on mowers.