Yes, since technology has advanced so much, you are able to go to www.Kubota.com and look through their products. Since they have all products listed, you will be able to find your tractors year.
To cut costs you can find a decent Kubota I2900 that is used at www.tractorhouse.com for about $8000-$8500. www.tractorbynet.com also offers a used Kubota I2900 for a higher price.
The Kubota I2900 can now be found online as well as replacement parts for the machine through this website http://www.rockanddirt.com/perl/search?&db=attachdb&sort=36&make=KUBOTA&start=1&method=search