09 Gussets Fit
The 09 style gussets do fit the 08 tunnel rolls. It takes a little bit of work but all you need to do is bend out the section of the tunnel roll past where the beaver tail section of the running board meets the main section of running board. Drill out a couple of the rivets on the beavertail section of the tunnel roll and bend the tunnel roll out til you get the clearance you need to make the gusset fit (about 1/4" or so), You just need to then rivet on the 09 gussets (no filing needed) and drill 1 new hole in the tunnel roll to rivet the tunnel roll back into place.
Looks like you replaced the tunnel rolls too. I know that the 07 and older tunnel rolls are much different, but the 08's look just like the 09's. Do the new style gussets fit into the 08 rails? I need this question specifially answered.
The 09 style gussets do fit the 08 tunnel rolls. It takes a little bit of work but all you need to do is bend out the section of the tunnel roll past where the beaver tail section of the running board meets the main section of running board. Drill out a couple of the rivets on the beavertail section of the tunnel roll and bend the tunnel roll out til you get the clearance you need to make the gusset fit (about 1/4" or so), You just need to then rivet on the 09 gussets (no filing needed) and drill 1 new hole in the tunnel roll to rivet the tunnel roll back into place.