When a recipes specifies bulk pork sausage, it's NOT breakfast sausage links, those little things you fry quickly and serve with eggs.
Bulk pork sausage usually comes in a one pound tube/roll, like Jimmy Dean, Western
Beef, etc. You take the wrapping off, mush up the sausage and it's like chopped meat. Make meatballs, stuffing, etc. out of it.
Nor is it like sausage links, that you can buy in the meat section, usually around $3 a pound. They're maybe 3 inches long, use them to make sausage and peppers.