If you can't find a bass tab, you are a good part of the way there with the guitar chords. The guitar chords are very likely to be the root notes for the bass part. A very simple bass line would be just following the chords (playing root notes). Usually, there will be some interval playing built around the root note. Have a go at using the chords tab and listen to see what the bassist in the recording does to build around the root notes. Have fun!
