I am replacing some headliner sections on a 2006 Hunter 38. I am guessing the 306 is similar. The fabric is called Whisperwall and it is pressed into a track and held in place by friction. No adhesives are used. The material can be purchased from Marlow-Hunter and is 54" wide. Only one color was used on all boat models. They charge $55 per yard and shipping was $60 for the oversized package. Attached is a diagram of the track installation and a video showing the how to press the material in the track. It's not hard work, just time consuming and tedious to get top quality finish.