Just for fun, I went to Rockauto and entered the part numbers with the two **s into their part number search box.
Most of the time they came back with the full part number.
The two *s seem to be numbers from 10 to 19 or so, no idea what the second digit means.
Actually, maybe I do. I just realized that it seems to be some category indicator.
"10" is a gasket. "12" is an ignition coil, so maybe its electrical.
Have not gotten any farther than that.