Anyone know what Tuners I can use as replacements on a Yamaha that would be simple plug and play? (no drilling!)

Not 100percent sure but all of these should work fine, they are like standard diamater. measure the holes where your current tuners go through. If the diameter is 10mm you should be fine.

There are cheaper ones around too.
Thanks - those were actually the ones I was looking at - I figured they'd probably work but wasn't sure of the sizes - guitar is not with me at the moment, so I can't measure the holes and the yammie website gives no specs on tuners...