Just wondering what the SN was of the F2. Is it after 48200IJ Also did these machines run wide row (36"-40") corn heads or narrow row (28"-32"). The reason I am asking I need the sprockets from the lower feederhouse that run the heads. I have the 13 tooth sprockets for running my 30" corn head. But to use my wide row 38" head I need a 25 tooth driver sprocket. Thanks, PJ