I know this is a stretch, but you might try Auto Zone. They USED TO sell small rolls of carpet that I used to cover speaker cabinets with. It was easy to work with, and held up really well. But of course that was more than a decade ago. LOL! They used to have black, charcoal, a tan that looked VERY SIMILAR to our fabled doeskin, blue, and red. Also, you might look into Cabela's or Bass Pro. They sell Marine carpet that I know you can get tan from. It's got a rubber backing, but is very flexible in the lighter weight stuff. I've done probably half a dozen or more boats with this style of carpet, and it's easily laid, and can hug the light contours that the rear plastics have. Just a couple ideas.