Is this pedestal the threaded base type that screws into a floor fitting, or an aluminum post about 3 inches in diameter with tapered ends. According to the Four Winns website parts catalog, it appears that the post might be the threaded base type. That P# is 030-0484, or SL1906PTM25-1 which shows "no longer available" on the Four Winns site. I see one of these on ebay.
http://www.ebay.com/itm/Attwood-Table-L ... WQ&vxp=mtrIf it is the 3 inch diameter alumunum tube with tapered ends, the part number is 030-0105 or ALM# Z76-9071VEL28-2. Ebay has this Stainless Steel tube that appears to be the same size.
http://www.ebay.com/itm/Zwaardvis-Z76-8 ... yf&vxp=mtrOr you might be able to get your your dealer to order this one if it is what you need.