Fits 60’s Slimeline bushing. These are specific to this type of tuner. Used on 60’s and 70’s Martin 12 string guitars and others. Because they are so short and an odd barrel diameter, they tend to fall out and get lost. No longer made or sold by Grover.
Price $25 shipping included.
The tuners came in both individual and ganged 6 on a side units.
Tuners look like this (not included)