Replacement Tuning Machines for FG-330 - Graphtec Ratio?

I haven't checked any late 70's models, but the earlier models have tuners was 6mm (.236") shafts vs. today's 1/4" (.250").  You'd have to change the bushings.  I have a FG-335 at home I could check. Or see this article. yamahavintagefg.boards.net/thread/225/replacement-tuners-vintage-yamaha-fg