How to add ripped audiobook tracks in proper order?

I'm trying to put an audio-book that I got from Amazon into my iPhone. The problem is that the book came on 8 CDs, each containing about 20 tracks. So after I ripped it, it created a mess of files names. So I sat down and diligently renamed all of them in the following order: DD.TT.mp3 where DD=disc number and TT=track number. I also went into each MP3 tag and gave it the same title. After that I dragged all MP3s into iTunes. Unfortunately what I got in iTunes is this:

As you can see, track 02.01 should not follow 01.01 and instead it would be as such:

01.01

01.02

01.03

and so on...

01.16

02.01

02.02

etc.

Any idea how to fix this with the least amount of work?

PS. I already spent about an hour trying to organize it.... so any help would be appreciated.