Actually the flush mount I was talking about is the standard flushmount in fishing kayaks. It is a tube that is mounted into the kayak in which you would stick the handle of a spinning rod. It is not suitable for fly rods and is only necessary if you want to carry a spinning rod also.

http://www.austinkayak.com/products/...od-Holder.html

If you are only putting two rod holders on, forget the flush mount and put the second scotty mount on the non casting side. Keep the casting side of the kayak as clear as possible for casting. The scotty fly rod mounts are great for spinning rods also.