When I refer to the long and short wheelbases I am referring to the standard tractor - NOT rowcrops. I have little experience of rowcrops - we have only 2 or 3 in the UK as far as I know. I don't know if there were long and short types of the rowcrops.
As I said earlier mine is a long wheelbase and it is a standard tractor - non-adjustable wheel width which were the predominant type in the UK. the length can be identified by the casting number on the chassis. For the long wheelbase it is 9217A on the cast frame (on the LHS, gearbox end). I can't remember what it was for the short wheelbase. I was once told by Howard Hill I think - maybe this note will raise him.
It will be interesting to see what you have
John.