Floor Boards

I have a 1998 Moomba Outback and need to replace the floor board that covers the drive shaft. Does any body known what the floor board material is? It is not plywood, some kind of plastic,fiberglass or composite material. There is a board material called Starboard and was wondering if that is it.

I'm not sure either but it is some type ABS type plastic board. What happened to yours? You should design it so you can get to the packing gland a little easier than taking out the floor and rear pads.