The originals had a "double bead" on the edge... hard to get it to show in pics, but maybe this one will show. I'm 110% certain that lid you have is not an original GM lid. As for silk screened AC instructions, these were found on most production line air cleaners, but many if not all over the counter GM versions lacked anything on the underside of the lid. I'm sure yours has nothing on the backside.
