How much is a small can mushrooms? Urgent!!!

This looks like an old recipe, and I remember - but don't see in grocery stores much anymore - old cans of mushroom about 6 or 8 oz each. Don't worry about being exact...mushrooms have few calories and this small volume will be mostly for taste.
The company's still in business and has an updated spaghetti and meatballs recipe, FYI:
https://americanbeauty.com/recipes/thin-spaghetti-with-meatballs-and-sauce