I'm looking for a midsection for my 1988 Johnson J140TLCCM. It is proving difficult to find one for a 20 inch. Looking on the Boats.net website I see that the part numbers for the 20 inch and the 25 inch are the same, as are the adapters. Can anybody shed any light on this? Is it possible that the two are the same and the extra 5 inches is achieved by some other means? Or is boats.net wrong?!!!