Pulled these off my 7421. They hold tuning very well, but I just replaced em with some planet wave auto trims and have no other guitars with an inline headstock.
I'll trade them for something cool, or weird, or whatever really, so long as it doesn't suck.
I have no clue what these are worth, I'm guessing 30 bucks? Something like that.
The specs are just little bits of wood. They come with 7 nuts, washers and screws that you need.