I don't have an answer for you for classical tuners other than measure yours carefully and try to match specs on various manufacturers web sites. One minor warning - I recently replaced the tuners on a 1930 Martin 0-17 (steel string slot head). The tuners that were on it had the shaft/knob towards the body from the gear which is backwards from the way most steel string tuners are set up. I used the StewMac golden age replacements - when I put them on the way the originals were they turned backwards (duh). I did mount them with the shafts away from the body which meant that the holes and imprint on the wood didn't line up.
Bad picture, but something to be aware of
