Replacing strings on a 1960's guitar?

Okay, so.. This seems to be a nylon guitar, by the description of the saddle. And I don't think that steel strings were used on these kind of saddles. So I recommend looking at this site: a href="http://www.frets.com/fretspages/Musician/Guitar/Setup/Classical/ClassicStr/classicstr1.html" rel="nofollow"http://www.frets.com/fretspages/Musician…/a It made sense to me. And to answer your question about buying these strings.. Guitar Center sells them.