Starter Problem

I don't know

The starter gear is "bouncing" at the start of the video. This seems to me to be an electrical problem, either in the starter, or just poor cables/ connections.

If you actually had "wrong parts" IE wrong converter, etc, the thing would simply not be able to engage at all.

There is only one bolt pattern for all gear drive starters, period, end of story.

Mopar starters are not designed to need shims. This is a "GM thing."