http://www.sporthitech.com/genuine-hipshot-button-set-of-6-a04-single-ring-keystone-also-fits-most-grover/I wonder if one couldn't just put the plastic tulip keys on a set of these.
Gotoh locking ones without the wheels. They look the most like non-locking ones that I could find.
Again, you may need conversion bushings if your holes are 10mm. Gotoh makes those as well.
I put a set of those on my '92. One of them started to split on the mold seam and started free spinning on the shaft. I put the Grover buttons back on. I like how they look, but it/they didn't last all that long (6 months or so?).
The new Kluson® Revolution 19:1 high ratio tuning machine are great,What Have FUN recommended. Constructed much like Grovers but with traditional Kluson "footprint".
Introducing the NEW Kluson® Revolution 19:1 high ratio tuning machine. These state of the art tuning machines are designed to directly retrofit die-cast tuning machines that have a hex head (collared) bushing and a traditional Kluson® two-screw mounting pattern. High gear ratio guarantees silky smooth operation, fine tuning stability with no backlash in a sealed one-piece housing. All mounting hardware is included.