What's The Deal With The Mopar Mini Starters?

Ours hit the block. Ground the nose carefully and it works like a champ.

We put it in front of a 904. Is there a difference when attaching to something later? I realize the bolt pattern is the smame for the engines, but is it possible the starters are "rotated' slightly on the later transmissions? I have a 904 and a 46RH lying next to one anothter at home so I'll look later. just a thought.