I have a 16'' and use this with great results:

http://www.musiciansfriend.com/drums-percussion/pearl-jg16-jungle-jig-floor-tom-to-bass-drum-converter-kit

I had an old junky Tama set that the 22'' BD hardware was disintegrating, so I took the left over pieces and made this:

[IMG]http://i136.photobucket.com/albums/q191/styng88/drumz/58e4027c.jpg[/IMG]

That's a 13'' rack tom that I put two other leg mounts on and viola, my FT. For that price, it's hard to beat.