It’s usually located right between the transom clamps. Yours appears to be missing. If you remove the cowlings, you’ll find the number stamped into the block/crank case. It’s small and you have to search for it but it’s there. Don’t recall specifically where on that model. Should be 7 digits.
Dave or others will have more specific info.
You could find a decent plate off a junk motor. They’re out there! Good luck!
EDIT: after re-reading your question, it sounds like you know it’s missing. An ad in the classifieds show rustle one up for you.
