If you are going to just replace a few guides or replace all of them here is a link to the Fuji Concept chart http://www.anglersresource.net/ar/pdf/guide.pdf it will give you a rough idea of where to place them and the sizes of the guides to use.

If you are replacing them all I suggest getting a Fuji Concept guide kit. It comes with all of the guides needed. You can get them from Jann's Netcraft (a board sponsor) in Alconite, Hardloy or SiC