Well, I have a 2010 Bighorn, its the exact floorplan as the Pinehurst. We still love our unit and the floorplan. I have replaced several seals. The D seal slides into a track, very easy to swap out. There is two screws holding it in place, one at the top and one at the bottom. If you need to replace the sweep you will have to remove the track that holds the D seal in place and then the sweep is held on with double sided tape attached to the Sweep. The hardest part was to clean all the old tape off the previous sweep. You will get the idea when you tear into it. Its not hard. Unfortunately, I am not at my rig where all my paper work is located. I think the D seal is a 1 inch and I think the sweep is considered a 2 inch but don't quote me on that. Maybe its a 3 inch sweep, not sure. Hopefully this helps a little. Now that I think about it, the sweep has the track built into it that holds the D seal. Again, you will get the idea when you start tearing into it.