I recall reading somewhere that the Fat Cat rim has a larger bolt pattern than the 200X but have not been able to find the specs to back that up!!
Very little documentation on the front wheel bolt pattern charts for the front of the Honda trikes (200x, 250r, 350x..fat cat)..
I know this isn't too helpful though..if I come across that thread or some spec data I'll be sure to forward it.
Current toys..
1986 Honda 350X..trail bomb!
1985 Honda 250SX..my main mudder
1985 Honda 250ES..Back in Black Trike
Current non-trike toys:
1990 Honda TRX300FW
1995 Seadoo GTX
1998 Polaris Indy Lite 340(Nearly new looking)
1998 Polaris Touring 500
1998 Club Car (electric)