Mercury 225HP 2.4L counter rotating

[trionfale]

I own a Mercury 1980 225HP 2.4L engine model No 1225620 (Serial No 05977120) extra-long shaft normal rotation.
What spare parts should I buy to make it counter rotating?
Is there any kit to make this change?

[T-REX]

Do U wan't tha mota to run backasswardz, or just tha prop to turn backasswardz???:rolleyes:

[scc82]

lowerunit.