Scott,
I found a pretty good one on Createsongstyles.com More the Credence version but the riff is there.
I went to Yamaha Styles section and searched for "Susie" and a page came up with the style, midi files, charts, etc.
There is a cost to join, but a money back guarantee if you don't think it's worth it. Ron is super! It has repaid me many times over.
http://createsongstyles.com/index.php?board=3.0