Help me identify!

Here,let me go through the baby steps:Right side of case/paasenger side of the tranny/the side with out the linkage/the side with the 3/4x2 inch machined stamping pad with the numbers on it at the front of the case as in the picture!This is best seen when there is day light,or with a flash light,and the pad sanded down,and on the bench,Mrmopartech