Briggs Cylinder Number

Hello everyone, I have a quick question.

I have a Sears Craftsman YT4500 with a 26hp Briggs Platinum twin, model 445877-1565-G5. I need to order a new cylinder head but am confused as to which cylinder is considered number 1 and which is number 2. Any help would be great.

Thanks

Shawn

Briggs Cylinder Number