ISI has released their Autodromo Nazionale della Brianza ( aka Monza ) track for rFactor. Scott J and everyone involved are to be commended for doing a fantastic job on the track. As you can see from the first screenshot, it includes 6 different configurations including the oval. Check below for some links to download mirrors for the 52MB file.

Download Mirrors for Autodromo Nazionale della Brianza / Monza:
Local Mirror
rFactor.net
rFactor Central