Mathews Legacy isn't even remotely close to the same as an XI Legacy. Don't even bother going there.
I can't vouch for the accuracy of the info, but check this out. Unfortunately, it still leaves you looking for axle to axle and brace height. For tiller, read the thread pinned to the top of the forum.
http://groups.msn.com/ArcheryRepair/xi1993stringandcablechart.msnw