OIL SEAL RINGS, #13 JUST RESTS IN THE TRANNY CASE SO BE CAREFUL NOT TO HAVE IT DROP OUT BEFORE WE TIGHTEN THE CYLINDER AND HEAD DOWN #12 FITS INTO #12 THEN INTO THE POCKET, IT IS ALSO NOT A TIGHT FIT SO DON'T LET IT FALL OUT #15 GOES AROUND THE FLANGE TYPE GUIDE PIN #10 THEN DOWN THE STUD HOLE