These tuning keys have quite a lot in common with the open gear, plastic-button tuning keys used on entry level guitars around the same time. They shared the same posts, gears, mouting screws and base plate. The footprint, post spacing (and therefore the required headstock holes) were identical, meaning any neck drilled for one set of keys, could be fitted with either. These metal button tuners were typically paired with the heavier hex-style ferules - as opposed to the lightweight round versions more associated with the plastic-button tuners.
List of Vox guitar tuning keys