I've seen a few versions of this that sound okay, but none of them are exactly right.  This version is 100%
correct based off of live performances by The Specials.
  
As usual with ska, play muted downstrokes on the beat and open upstrokes on the offbeat.  All the chord
shapes are based off of a basic F chord.

   1 + 2 + 3 + 4 +    1 + 2 + 3 + 4 +
E| x-8-x-8-x-8-x-8- | x-1-x-1-x-3-x-3-
B| x-8-x-8-x-8-x-8- | x-1-x-1-x-3-x-3-
G| x-9-x-9-x-9-x-9- | x-2-x-2-x-4-x-4-
D| x-10x-10x-10x-10 | x-3-x-3-x-5-x-5-
A| ---------------- | ----------------
E| ---------------- | ----------------
         C              F       G

That's it for the entire song.  Have fun!