I got these  3rd hand supposed to have come from a school? Handles are longer than the ones I have "but" I forgot to measure them.....doah
Do they look familiar?  if they are a set which one is missing? The wide ones fit the custom rack, just a guess where they went for the other ones.

they average 17" to 17 1/2"  here is a pic of one out of the rack.

You might take this question over to one of the turning fora, like http://www.woodcentral.com/woodworking/forum/turning.pl