The filter set that Oliver has listed above is the one that I am using. They used to be $50 or so which in my opinion was overpriced especially compared to what they are now. I mounted mine filters in an aluminum enclosure with a switch on the front to select the individual bands. Be sure to get yourself a fan to mount on the side of the heatsink. Tehy ahve convienently pit a connector on the board to power the fan.
Here is an old picture of mine while I was still in the testing stages and before I mounted the fan on the side. There is a heatsink and fan available on ebay that fits the board perfectly. I also made a PTT cable up for when I use it with the FT-817ND.