Thanks for sharing,
Normally when you go to apply for the Police clearance certificate in Ontario, they will inform you what kind of police clearance you need for US immigration. I have posted the link where it mentions what kind of PCC you need for immigration. Hopefully the other members follows the instructions.
https://travel.state.gov/content/travel/en/us-visas/Visa-Reciprocity-and-Civil-Documents-by-Country/Canada.html