Matrix 12 Encoder Kit

Interested in the MA-12 encoder kit. Says it doesn’t work with versions that have the encoder on top of the board. Is there a way to tell by serial # if my encoders are on top or below?
Also, does anyone have a copy of the install instructions they can send to me?

Is your Matrix 12 made in the US or Japan?

Most likely the Syntaur encoders are for the US model.