this is defenetely [spelled wrong? correct me, please, so i can learn] a n00b question but, anyway!
KY1 + XRT for Kyoto 250
KY1 + FO8 for Kyoto 500
hope this answers your question, mate!
also, being part of the practice sessions is kind of mandatory!! you have to complete your milleage around the track [150 online laps LEAST, if i aint wrong] and be in 3 or 4 practice sessions [so they can watch you and decide if you are capable of running together with other 30 cars and so...]