This kit includes all the needed parts to professionally convert your tunnel and slide rails from 121" to 136".  The only part not included is the track.  Stock track drive sprockets can be used with 2" notched track.  8 tooth drive sprockets must be used for 2 1/4" notched tracks.  

Kit contains: tunnel extension, hose guard, rail extension, rivets and instructions.

Not for use with M10 suspension.