There isn't really anything similar in style to the OEM tires..and in general the choices in 9" tires to fit the OEM rims are getting slimmer by the day.
But using a modern rim that has OEM geometry gives you a lot more choices..example: ITP Steel 12x7, 2+5, 4/100 is a dead nuts fit. Then there is a ton of tires to choose from in 12"
Have some with it, I think you'll be happy with the results.
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)