3g restore from specific backup

I upgraded to 3.1 last week and had major issues with it freezing up so badly it required a hard reset. So I downgraded to 3.0.1 which wasn't an easy task. I ran a backup before I upgraded to 3.1. I ran another back before I downgraded. It won't let me restore from the latest backup because it was from 3.1 firmware. The backup that I ran using the 3.0 firmware doesn't show up in the list to restore from. If I look in ~/Library/Application Support/MobileSync/Backup I see 4 backup folders. Inside the latest modified folder, I see some files that were created 9-9 which is when I did the upgrade. There are also files with today's datestamp in the same folder. Is there any way to restore to the 9-9 backup?